Advanced Combat Supply is a tier 2 equipment expertise training option in Battlefield Play4Free for the Assault Kit. When taken, it allows the soldier to place two ammunition boxes at any one time to further increase their ability to resupply themselves and allies.
With a lack of static Ammo boxes on the maps, ammunition can be hard to come by in Battlefield Play4free. Only the Assault Kit can supply it to other soldiers on the battlefield. This training option allows soldiers to increase their usefulness to the team, allowing them to create multiple points to restore ammunition to other players or to resupply a lot of ammunition in a single place.
As it requires at least five points spent in to the equipment expertise tree and all four ranks of Ammo Box training, this training option is better for players who are around rank 10 to 20 that know when and where ammunition will be needed. There is only a single rank for this option, but it essentially doubles the Assault Kit's effectiveness in battle.