Name of side.
Can be West, East, Civilian, Resistance, sideLogic, Friendly, Enemy or Unknown.
In ArmA, BLUFOR is west, OPFOR is east, Independant/RACS is the resistance.
In ArmA2, BLUFOR (USMC and CDF) is west, OPFOR (Russia and Insurgents) is east, Independent is the resistance, ambient life (animals) are ambient life, modules are sideLogic.
In Arma 2 OA, BLUFOR (US, CZ, DE, UK(BAF)) is west, OPFOR (TK, TK_INS) is east, Independent (TK_GUE, PMC, UN_CDF) is resistance.
See also: Side relations, and faction.