01 — Unit types (Units/Units.txt)

Index · Basics · Catalog: A1

A [UNIT] entry defines a unit type: anything that exists on the map and belongs to a faction — buildings, armies, ships, submarines, aircraft, satellites. (Missiles in flight also behave as units on the map, but they are defined in Missile_defs.txt; cities are handled by the special VirtualCity entry.)

[UNIT] "Fighter"
  Tech "U_Fighter"                       // required: availability + display name
  Type Airborne                          // required
  Movie "Units/Images/Airborne/Topdown/Fighter_1.midx"   // required
  Power 0.65
  Speed 700
  Range 2400                             // flight range: needs a Crash explosion
  Size 0.05
  TurnSpeed 9
  MaxElevation 20
  ProductionCost 1.0                     // required, > 0
  Crash "std_bomb"
  Slave
  AutoReturn Yes
  Radar "STD Vision Air"
  Radar "Air Vision"
  Config "Air-To-Air" Default
    Weapon "AAM" 2 Launch 1 Time 120 AutoEngage
    Weapon "Plane Gun" 20000 Launch 1 Time 6 AutoEngage
  ImprovedBy "Generation_2_Aircraft"
  {
    Set Speed 800
    Set Range 2800
  }

Properties can appear in any order. Everything not written takes the default shown below.

---

1. Identity and availability

Property	Syntax	Default	Meaning
Tech	Tech "tech_id"	— required	The unit can be built only when this technology is known; its name is the unit's display name. Give every unit its own zero-cost tech whose parent is the real research tech.
DisablingTech	DisablingTech "tech_id" / NULL	none	When the owner knows this tech the unit type is no longer available (used for obsolescence).
Type	Type Ground\|Naval\|Subwater\|Airborne\|Satellite	— required	Movement domain and targeting class. Also accepted but meant for internal types: Missile, HighMissile, SubwaterMissile, City, AbstractPosition. Setting Type also sets defaults: Airborne → AutoReturn Yes; Naval/Subwater → MaxTiltDivider ×5; Ground → can access unit and weapon stockpiles; Ground/Naval/Subwater → TargetInPlanner Yes.
Class	Class "UC_…" / NULL	auto by Type	Unit class (an [UNIT_CLASS] from tech.txt), used in the production and diplomacy UI. If absent, the class whose AutoAssignTo matches the unit's Type is used.
ChangeTypeOnTech	ChangeTypeOnTech "tech" to "Unit_ID" / NULL	none	Existing units of this type automatically turn into Unit_ID when the owner learns tech. Ignored if the target is the same type, or if tech equals the unit's own Tech.
AchievementProperty	AchievementProperty "ACH_ID" [check "tech"]	none	Marks the type for a Steam achievement check (optionally only when tech is known).

2. Core combat statistics

All of these can be changed by tech modifiers (see 06).

Property	Syntax	Default	Meaning
Power	Power <float>	1	Hit points. Explosion damage is subtracted; the unit dies at ≤ 0. Also scales repair speed (see AutoRepair).
Size	Size <km>	1	Physical radius used by hit calculation: a blast reaches the unit if distance − Size ≤ blast radius, so bigger units are easier to hit. It also sets the area that bombers/precision weapons are evaluated against.
Speed	Speed <float>	0	Movement speed. 0 = immobile. Do not change it with dynamic modifiers (InRange, Explosion, Terrain, AffectedBy) — use simple ImprovedBy only.
VirtualSpeed	VirtualSpeed <float>	0	For "teleporting" relocations: the speed used to compute relocation time.
TurnSpeed	TurnSpeed <float>	1	How fast the unit turns.
Range	Range <km>	0	Flight range (fuel) for aircraft. A unit with Range > 0 must also have a Crash explosion. The AI and the path UI keep a safety margin; a unit that exceeds its range crashes.
MinElevation, MaxElevation (alias Elevation)	<km> [Real]	0	Altitude band the unit flies in (an aircraft cruises at MaxElevation). Radars with a lower MaxHeight cannot see it. ★ With Real in real km (see below). Shipped: helicopters 1, fighters, attack, EW aircraft and transports 10, bombers, AWACS and SOF aircraft 12, interceptors and high-speed bombers 20, spy planes 25 (Real).
ProductionCost	ProductionCost <float>	— required, > 0	Production points to build one. Also the base of repair speed.
MaxNumberOnMap	MaxNumberOnMap <int>	1 000 000	Maximum alive units of this type per faction.
MaxNumberToOrder	MaxNumberToOrder <int>	unlimited	Maximum that can be in the production queue at once.
CanBeBuilt	CanBeBuilt Yes\|No	Yes	No = never appears in production (units created by scripts, Produces, or as states). Tech-modifiable as a number (0 = no).
AutoRepair (alias AutoHealing)	AutoRepair Yes\|No\|<float>	1 (Yes)	Repair rate multiplier for non-flying units. Repair happens only where repair is allowed (own territory, or within a friendly RepairRange) and heals AutoRepair × MaxPower × RepairValue ÷ (ProductionCost × 0.01) per step — expensive units heal proportionally slower. 0 = never repairs.
DecayTimer	DecayTimer <ticks>	0 (off)	The unit loses Power ÷ DecayTimer every tick, dying after that many ticks (temporary units).
Crash	Crash "explosion_id"	none	Explosion produced when the unit is destroyed or runs out of fuel. Required when Range > 0. It hits ground, naval and city targets around it.
SelfDestructTime	SelfDestructTime <s>	0	Time the self-destruct order takes.
Disassemble	Disassemble <float>	−1	Not used by the game.

★ Real heights. The game flies its aircraft higher than real ones for the sake of the view, most of all the lowest: up to 1000 km a game height is 1000 × (real / 1000)^0.8 (real 1 km is 4 in the game, 10 km is 25, 100 km is 158), above 1000 km the same. A height followed by Real is in real km and converted on loading, e.g. MaxElevation 10 Real (25 game km); without it, in the game's km as before (mods keep working). The info panels and the Explodopedia show real km. Real works for MaxElevation, MinElevation, MinExplosionHeight, a radar's MaxHeight, and the Set, Set Max and Set Min modifiers of these (ImprovedBy "X" Set MaxElevation 25 Real); not with Add or Multiply. Shipped in real km: the aircraft and helicopters and the anti-aircraft weapons; the satellites, the shuttle, the ballistic missiles' Elevation, the anti-missile weapons and the radars stay in game km.

3. Weapons

3.1 Weapon configs

A unit has one or more weapon configs; the player (or AI) switches between them. Each config is a list of weapons.

Config "ASM" Default                 // [Default] [OnlyFull] [Special]
  Weapon "ASM" 2 Launch 2 Time 90 AutoEngage
  Weapon "AAM" 2 Launch 1 Time 60 AutoEngage Principal

A Weapon line written without any Config before it creates a single config named default. A unit with only one config always treats it as its default.

Config flag	Meaning
Default	The config selected when the unit is built.
OnlyFull	The config can be selected only when the unit is fully loaded.
Special	Special config (not offered as a normal choice by the AI).

3.2 Weapon line

Weapon "missile_id" <stock> [Launch <n>] [Time <t>] [AutoEngage [WhenAttacked [ByNuke] [AIOnly]]] [Principal] [DefaultOff] [LaunchPoint <n>]

Part	Default	Meaning
<stock>	—	Number of missiles carried in this config (use a large number such as 20000 for guns/lasers).
Launch <n>	1	Missiles fired per salvo.
Time <t>	1	Reload time between salvos, in reload units (Time 30 = one "second", see 00 §6). Scaled by the global GlobalMissileLaunchDelayModifier.
AutoEngage	off	The weapon may fire automatically. WhenAttacked = only after the unit was attacked; ByNuke = only after a nuclear attack; AIOnly = the restriction applies only to AI factions. Scripts can override per unit with Weapon_Use.
Principal	off	The weapon that represents the config in the UI/AI evaluation.
DefaultOff	off	The weapon starts switched off (the player can switch it on; relevant for Switchable missiles).
LaunchPoint <n>	0	Which model launch point (3D) the missile leaves from.

3.3 Upgrading configs with technologies

• Replace a config's contents when a tech is known — put ImprovedBy "tech" directly after the config's weapons, followed by the new weapon list:

Config "Air to Air" Default Weapon "AAM" 2 Launch 1 Time 120 AutoEngage ImprovedBy "Generation_3_Aircraft" Weapon "LAAM" 4 Launch 2 Time 120 AutoEngage * A config that exists only after a tech — an empty Config followed by ImprovedBy "tech" and weapons (used for the bombers' AL-ICBM configs). Alternatively, anywhere in the entry: ImprovedBy "tech" Config "name" followed by Weapon lines. * Change launch count / reload of one weapon — ImprovedBy "tech" Modify Weapon "missile" <op> Launch|Time <value> (see 06). Example from the data: ImprovedBy "Spec_Ops_Boost_1" Modify Weapon "Small Arms" Set Time 4.

Config-replacing ImprovedBy must be a simple ImprovedBy "tech" (no Unit/InRange, no Modify).

3.4 Other weapon-related properties

Property	Syntax	Default	Meaning
CanStoreMissiles	CanStoreMissiles "missile" <n> [DefaultOff]	none	Extra magazine carried by the unit (e.g. bombers' nuclear stock, carriers' aircraft munitions). Hosted units rearm from it.
AttackDelay	AttackDelay <s>	0	Readiness build-up: the unit must "prepare to attack" for this long before its weapons fire; readiness decays while moving (unless it can attack on the move) and cancels after AutoCoolDownDelay of inactivity.
AttackOnMove	AttackOnMove Yes\|No\|<float>	Yes (1)	Whether the unit can fire while moving (> 0 = yes). Tech-modifiable, so a tech can grant it. Units that cannot attack on the move also turn to face the target first.
ModelLaunchTime	ModelLaunchTime <s>	1	Length of the 3D launch animation.
AutoCoolDownDelay (alias AutoCancelReadinessDelay)	<s>	10	Idle time after which attack readiness is lost.
WeaponsActivationDelay (alias WeaponActivationDelay)	<s>	0	Fixed delay before weapons work after deployment/launch.
WeaponsActivationDelayMult (alias WeaponActivationDelayMult)	<float>	0.25	Additional delay = this × each weapon's reload Time.
SensorsActivationDelay (alias SensorActivationDelay)	<s>	0	Delay before radars work after deployment.
ShowDisabledOnDeploymentMarker	Yes\|No	Yes	Shows the "not yet active" marker during these delays.
NoAutoAttack	NoAutoAttack [Yes\|No]	auto-attack on	The unit never picks targets on its own.
NoAutoAttackSub	NoAutoAttackSub [Yes\|No]	on	Same, against submarines only.
MaxAutoEngageRange	<km>	1000	For hosted units (aircraft): the host auto-launches them only against targets within this distance.
CheckTargeting	CheckTargeting BY "missile" [OR "missile"…] Message Lock <strID> NoLock <strID>	none	Shows lock/no-lock messages (string IDs from UI.lng) when this unit is or is not covered by the listed enemy weapons (e.g. jammers). Also registers those weapons for InRange checks.
CheckCoverage	CheckCoverage "missile" BY "radar" [OR "radar"…] Message <strID>	none	Warns the player (string ID) when firing missile without coverage from one of the listed radars.
InfluencesAllies	Yes\|No	Yes	Whether the unit's aura-type weapons (buffs/debuffs checked through InRange) also affect allies.

4. Sensors

Property	Syntax	Meaning
Radar	Radar "radar_id" [DefaultOff]	Adds a sensor. DefaultOff = starts switched off. List property.
Tech-dependent radar set	ImprovedBy "tech" followed by Radar "…" lines	When tech is known, the whole radar list is replaced by the listed radars. Sets defined later are checked first; the first set whose tech is known wins.

Plain Radar lines always belong to the base list, wherever they are written (also in later MODIFY entries); tech-dependent sets are kept separately.

Radar ranges and detection classes are defined in 04 — Radars.

5. Carrying other units

5.1 Airways (aircraft launch/landing channels)

Airway Launch 2 Time 60                      // airway 0
Airway Launch 1 Time 90                      // airway 1
CanHostAircraft "Fighter" 24 Patrol 4 AIAutoPatrol
CanHostAircraft airway 1 "AWACS" 2

Property	Syntax	Meaning
Airway	Airway [Launch <n>] [Time <t>]	Declares a launch channel: n aircraft per launch (default 1), t reload units between launches (default 1). Scaled by GlobalAircraftLaunchDelayModifier.
CanHostAircraft (alias CanHostAircrafts)	CanHostAircraft [airway <i>] "Unit_ID" <count> [Patrol <n> [AIAutoPatrol]]	Unit type hosted on airway i (default 0) with capacity count. Patrol n = how many can be sent on patrol at once; AIAutoPatrol lets the AI patrol automatically. The airway must have been declared.
MaxAutoEngageRange	see §3.4
OnDeployLaunchHostedDelay	<s>	Delay before hosted units can launch after the host deploys.

A unit may have at most 3 channels in total (airways plus the hangar channel created by CanCarryUnit/HangarExit).

5.2 Hangar (transport of ground units)

Property	Syntax	Default	Meaning
CanCarryUnit	CanCarryUnit "Unit_ID" [build <n>]	—	The unit can transport this type in its hangar. build n = it comes with n of them. Creates the hangar channel automatically.
HangarExit	HangarExit [Launch <n>] [Time <t>]	1 / 1	Unload rate of the hangar.
HangarMaxLoad	<int>	sum of build loads	Hangar capacity in space units. Raised automatically to fit the initial load.
HangarSpaceRequired	<int>	1	Space this unit type takes in someone else's hangar.
TimeToBoard, TimeToUnboard	<s>	0	Boarding/unboarding time.
ReportAsHosted	Yes\|No	No	While inside a host, the unit is still reported (e.g. listed with the host).

5.3 Being hosted

Property	Default	Meaning
Slave	No	The unit belongs to a host (aircraft): it must stay within safe return distance of the host, is not a war-planner target and gets different AI handling.
AutoReturn	Yes for Airborne, else No	Returns to its host automatically after the mission.
CanPatrolPoint	No	Can be ordered to patrol a point.
CanHangInTheAir	No	Can loiter (helicopters, drones) instead of needing to keep flying.
ProducedByAnotherUnit	No	Built by another unit, not by the faction's production (excluded from planner targets).

6. Readiness states (submerge/surface, deploy/undeploy)

Two unit types can form a pair of states — for example Submarine (low) and Submarine_Surfaced (high). The unit switches between the types, keeping its identity.

[UNIT] "Submarine"                    [UNIT] "Submarine_Surfaced" COPY "Submarine"
  HighState "Submarine_Surfaced"        HighState NULL
  TimeToHighState 3.0                   LowState "Submarine"
                                        TimeToLowState 3.0
                                        SpecialState Yes

Property	Syntax	Meaning
HighState, LowState	"Unit_ID" / NULL	The type to switch to.
TimeToHighState, TimeToLowState	<s>	Switching time.
SpecialState	Yes\|No	This type is only a state of another unit: it cannot be built and is not a planner target.
RetreatShift, AttackShift, DefenceShift, FastMoveShift, UnderIceShift	High\|Low\|None	Automatic state change when the unit retreats, attacks, defends, moves fast or goes under ice.
AutoOnMoveShift	High\|Low\|None	State change when ordered to move.
AutoOnRest	High\|Low\|None	State change after resting for AutoOnRestDelay seconds.
HighStateStringIDX, LowStateStringIDX, StateStringIDX	<strID>	UI strings for the state buttons/label (default 2447).
ToHighStateProcessStringIDX, ToLowStateProcessStringIDX	<strID>	UI string while switching.
StateIcon, ToHighStateIcon, ToLowStateIcon	"image" / NULL	Icons for the state UI.

7. Occupation (armies)

Property	Syntax	Default	Meaning
OccupationRadius	<km>	none	Makes the unit an occupier (it can capture cities/units). Not allowed for flying units. Also disables crossing borders in peace time.
TimeToOccupyMult	<float>	0	Makes the unit occupiable (> 0) and multiplies the time needed to capture it. For cities the time also depends on population, see globals below.
ExecuteOrdersWhenBesieged	Yes\|No	No	Whether an occupiable unit under siege can still act (self-destruct, attack…).
CanCrossBorder	Yes\|No	Yes	No = never leaves own territory.
CanCrossBorderDuringPeaceTime	Yes\|No	Yes	May enter foreign territory before war.
AlwaysVisibleOnEnemyTerritory	Yes\|No	No	Revealed to the territory owner while inside it.

8. Support and logistics

Property	Syntax	Default	Meaning
ResupplyRange	<km>	0	Friendly units within this distance can rearm (and repair) as if at home. Implies CanAccessGlobalStorage.
RepairRange	<km>	0	Friendly units within this distance repair.
CanAccessGlobalStorage	[Yes\|No]	Ground: Yes	Shortcut for both stockpile flags below.
CanAccessUnitStockpile	Yes\|No	Ground: Yes	Can draw units from the faction's reserve when outside own territory.
CanAccessWeaponStockpile	Yes\|No	Ground: Yes	Can draw weapons (e.g. nukes) from the faction stockpile when outside own territory.
Produces	Produces "Unit_ID or missile_id" / NULL	none	The unit can produce these units or missiles itself. List property.
ProductionPlacementRadius (alias UnitPlacementRadius)	<float>	0	Where produced units appear around the producer.

9. Politics, visibility and war triggers

Property	Default	Meaning
HiddenFromAllies	No	Allies do not see this unit.
HideOwnership	No	Enemies (other than permanent allies) do not see who owns it.
AttackIfDestroyed	No	Losing this unit triggers limited escalation (the owner may then nuke cities); automatic attacks on such units are disabled.
DoesNotTriggerWarWhenAttacked	No	Attacking this unit does not start a war.
DoesNotTriggerWarOnAttack	No	Attacks by this unit do not start a war.
DestroyOnFactionSurrender	Yes	Removed when its owner surrenders.
CanSetDEFCON	No	Owning this unit allows changing DEFCON.

10. AI and war-planner hints

Property	Syntax	Default	Meaning
AttackerInPlanner	[Yes\|No]	No	The war planner may use this unit as an attacker.
TargetInPlanner	Yes\|No	Ground/Naval/Subwater: Yes	The war planner may target it. Cleared by Slave, ProducedByAnotherUnit, SpecialState.
MoveToTarget	MoveToTarget ANY / MoveToTarget [AVOID] "Unit_ID"	none	For raiding units (spec-ops): which target types the AI moves towards (ANY) or must avoid (AVOID). List property.
MoveToTargetInWarPlan	[Yes\|No]	No	Also move towards targets while executing a war plan.
NoAutoDeploy	[Yes\|No]	No	Not deployed automatically at game start / auto-deploy.
DoNotShowInEncyclopedia	[Yes\|No]	No	Never mentioned in the Explodopedia (14): no page, and no icon, link or row naming it on other pages. Alias DoNotShowInExplodopedia.
BlockedZoneTypeID	"zone_type" / NULL	none	AI "blocked zone" category this unit creates (areas the AI avoids). A technology can reset zones with ResetBlockedZone.
Helper, AIVarietyHint	"text"	—	Accepted and ignored.

11. Presentation

Property	Syntax	Meaning
Movie	"file.midx" / NULL	Required. Map sprite/animation.
AbstractMovie	"file" / NULL	Sprite for the abstract (flat) map mode.
Model	"file" / NULL	3D model for terrain view.
Icon, RoundIcon	"file.png"	UI icons; default to frame IconIDX of the movie; RoundIcon defaults to Icon.
IconIDX	<int>	Frame of the movie used as icon.
LaunchMePathIcon	element "ui_element" / NULL	Path icon used when this unit is launched (default "path/launch STD").
DrawSize, ModelDrawSize, AbstractDrawSize	<float>	On-screen size (default 32): DrawSize the map picture, ModelDrawSize the 3D model (default DrawSize), AbstractDrawSize the zoomed-out icon (default DrawSize). A picture or model drawn bigger or smaller in its frame (an upgrade's, a faction's own) gets a Scale in its .midx (12). For a seamless switch the unit itself should look as big in its picture as the model when the unit switches to it.
★ ModelSwitchSize	<float>	The unit is drawn as its 3D model once the model is this big, in % of the screen's width (default 2); its map picture before. A unit with a big picture (an airport, a base) switches when its model has grown as big as the picture: e.g. ModelSwitchSize 5.2 with DrawSize 35, ModelDrawSize 90.
★ LaunchSmokeSize	<float>	Its missiles' launch smoke this many times as big (default 1; the smoke is measured in the launcher's model lengths). None of the shipped units sets it (Launch_Smoke itself is 0.75 launcher lengths).
HideAbstract	Yes\|No	Hide in abstract mode.
FollowRadius	<float>	Radius of the follow/selection circle (default DrawSize ÷ 1.35).
DrawOrder	<int>	Drawing order among units of the same class (smaller first).
FixedRotationAngle	Yes\|No	Sprite does not rotate with heading.
MaxTiltDivider	<float ≥ 1>	Banking when turning (larger = less tilt; default 1.5, ships ×5).
ForceMipMap	Yes\|No	Force mip-mapping for the sprite.
Sound	Sound <id> [Volume <f>]	Selection/voice sound.
LaunchMeSound	LaunchMeSound <id> [Priority <n>] [SoundSize <f>] [Speed <f>] [MuteLength <f>]	Sound when launched from a host.
LaunchMeSoundUI	<id>	UI sound when launched.
DestructionMessage	Default\|None\|GroundMobile\|Ground\|Naval\|Subwater\|Airborne\|Missile\|Satellite\|City (unquoted, case-sensitive)	Which "unit destroyed" message category to use.

12. Modifier tags

Modifier "tech_id" [value <float>] attaches a tag to the unit type. Tags do nothing by themselves; tech modifiers elsewhere test for them with ImprovedBy Unit "tag" / AffectedBy Unit "tag" and can use the tag's value with the value keyword. The tag must be a technology ID in tech.txt (usually a zero-cost tech that is always known, or the tech that activates the effect).

[UNIT] "Stealth_Bomber"   Modifier "Bomber_Stealth_Bonus_Modifier_1" value 0.5         // illustrative
[RADAR] "STD Long Wave"   AffectedBy Unit "Bomber_Stealth_Bonus_Modifier_1" Range value    // ×0.5 against that bomber

A tag with value 0 is still present. Tags can be added or removed dynamically with the Modifier property of a tech modifier (Set Modifier, Delete Modifier), see 06.

13. Tech modifiers on units

ImprovedBy … and AffectedBy … lines (and { … } blocks) change unit properties when technologies, tags, auras, explosions or terrain apply. Unit property names usable in modifiers: Speed, VirtualSpeed, TurnSpeed, Range, Power, Size, ProductionCost, CanBeBuilt, MaxNumberOnMap, MaxElevation, MinElevation, DisassembleTime, ResupplyRange, RepairRange, AttackDelay, AttackOnMove, ModelLaunchTime, Movie (appearance), Modifier (tags), Config/Radar (replacement lists), Modify Weapon. Full grammar in 06.

ImprovedBy "Generation_4_Aircraft"
{
  Movie "Units/Images/Airborne/Topdown/Fighter_4.midx" Icon "Units/Images/Icons/Airborne/Fighter_4.png"
  Movie Model "Units/Images/AIRBORNE/4th Gen Fighter.midx"
  Set Size 0.03
  Set Speed 1000
  Set Range 3750
}

14. Global unit settings (top level of Units.txt, outside any entry)

Setting	Default	Meaning
GlobalSpeedModifier <f>	1	Multiplies every unit's speed.
GlobalAircraftLaunchDelayModifier <f>	1	Multiplies all airway/hangar launch delays.
GlobalMissileLaunchDelayModifier <f>	1	Multiplies all weapon reload times.
GlobalCitySizeModifier <f>	1	Multiplies city radius for blast calculations (bigger = more exposed).
MinTimeToOccupyCity <s>	0	Lower bound of city capture time.
MaxTimeToOccupyCity <s>	900 (15 min)	Upper bound of city capture time.
MinTimeToOccupyUnit <s>	0	Lower bound of unit capture time.
CityOccupationMultPerPercent <s>	60	Capture time per 1 % of the faction's initial population living in the city (× occupier's multiplier).
UseAbsolutePopulationForOccupationTime Yes\|No	No	Use absolute population (per million) instead of percent of the faction.

Shipped values: MinTimeToOccupyCity 150, MinTimeToOccupyUnit 30.

15. VirtualCity — the city pseudo-unit

Cities are not [UNIT]s, but [UNIT] "VirtualCity" MODIFY (the only allowed form) attaches properties to all cities. Useful properties:

• Modifier tags (e.g. "Resist_Nuke_ABM", "EMP_Defence_Mod_3") that weapons test with AffectedBy Unit.
• ImprovedBy / AffectedBy on the city economy: Production, Science, Espionage (multipliers of the city's output), plus Power, Size, MaxNumberOnMap, ResupplyRange, RepairRange.

[UNIT] "VirtualCity" MODIFY
  ImprovedBy "Production_Booster_1" Production 1.10
  ImprovedBy InRange "Research_Buff" Science 1.10         // aura from the Research Center
  AffectedBy Explosion "EMP_Blast" Complex Production
    case "EMP_Defence_Mk4" Multiply 0.75
    default Multiply 0.25
  ImprovedBy "DEFCON_2" Production 0.75                   // DEFCON penalties are modelled this way

The city's technology is U_City. Cities are hit by any missile whose type Affects City (see 02).

16. Checklist for a new unit

1. Add [TECHNOLOGY] "U_My_Unit" with Name/Description in tech.txt, a Parent or a LeadsTo from the research tech, and the strings in lang/*/tech_t.lng.
2. Add [UNIT] "My_Unit" with Tech, Type, Movie, ProductionCost, Power, Size, and Speed if mobile.
3. Give it at least one sensor (Radar "STD Vision" or similar) — units see nothing without one.
4. Add weapons (configs), and Crash + Range if it flies.
5. Add hosting (CanHostAircraft on a carrier/base) if it is an aircraft.
6. Start the game and make sure no "unknown keyword" error appears (see 00).