All factions start off with three basic training structures which produce units along different paths of warfare, such as melee or ranged combat. In most cases, units can be trained in three different structures to produce more highly skilled infantry or Battle Gears (commonly abbreviated as BGs) to improve their combat ability. This allows lower tiered units to defeat higher tier units, which they could not normally defeat. BGs also allow the player to further define the role of a unit, such as damage absorption, building destruction, or reconnaissance.