In addition to controlling units, players may also call in tactical aid by spending tactical aid points. Points are primarily earned from destroying enemy units in battle. Tactical Aids allow the player to call in anything, from airstrikes on enemy positions, the deployment of paratroopers, to launching carpet bombing raids and tactical nuclear strikes. Tactical aids can allow up to three deployments, after which the player must wait until the support has recharged. In the single-player campaign, players are restricted by what tactical aid they can use, which can change during a mission.