Unit Type Role Flags

Every unit type (e.g. a unit such as a Phalanx) in a ruleset can be given zero or more roles by ruleset modders. Each role gives additional features to the unit type that has been assigned the flag. A reader can find the roles by looking at the units.ruleset file in any ruleset directory. The following roles are used in all of the rulesets shipped by the Freeciv21 developers.

AttackFastStartUnit: Can be designated as an attacking unit at game start.
AttackStrongStartUnit: Can be designated as a strong attacking unit at game start.
Barbarian: Can be created as land Barbarian.
BarbarianTech: Can be created as land Barbarian, if someone has researched its technology requirements.
BarbarianBoat: Can be created as boat for sea Barbarian.
BarbarianBuild: Can be built by barbarians.
BarbarianBuildTech: Can be built by barbarians if someone has researched its technology requirements.
BarbarianLeader: This unit is the Barbarian Leader. Only one can be defined once.
BarbarianSea: Can be created as a Barbarian that disembarks from a barbarian boat.
BarbarianSeaTech: Can be created as a Barbarian that disembarks from a barbarian boat if someone has researched its technology requirements.
BorderPolice: Can peacefully expel certain foreign units. See Expellable.
CitiesStartUnit: Can be designated as city founding unit at game start.
DefendGood: AI hint: Good for defending with.
DefendGoodStartUnit: Can be designated as an good defending unit at game start.
DefendOk: AI hint: Ok for defending with.
DefendOkStartUnit: Can be designated as an ok defending unit at game start.
DiplomatStartUnit: Can be designated as Diplomat unit at game start.
Expellable: Can be peacefully expelled from foreign tiles. See BorderPolice.
Explorer: This unit performs Explorer functions.
ExplorerStartUnit: Can be designated as an Explorer unit at game start.
Ferryboat: AI hint: Useful for ferrying.
FerryStartUnit: Can be designated as a ferry boat unit at game start.
FirstBuild: First to be built when a city is founded.
HeavyWeight: Airliftable from Airport after you learn Fusion Power.
Hut: Can be found in a hut.
HutTech: Can be found in a hut.
Partisan: Can be created as a Partisan. Only one unit can have this flag.
LightWeight: Airliftable once you learn Flight.
MediumWeight: Airliftable from Airport after you learn Advanced Flight.
Settlers: Acts as a Settler type unit.
WorkerStartUnit: Can be designated as a Worker unit at game start.