Types/AmmoSourceType

A string. Either "default", "player", "turret" or "vehicle".

Used in Types/AmmoType by Prototype/AmmoItem#ammo_type, to enable specifying different ammo effects depending on which kind of entity the ammo is used in.

If ammo is used in an entity that isn't covered by the defined source_types, e.g. only "player" and "vehicle" are defined and the ammo is used by a turret, the first defined AmmoType in the array in Prototype/AmmoItem#ammo_type is used.