The major new gameplay feature is a system called "Close-Range Assault" (CRA), which aims to increase the intensity and bring the action closer to the player, without the feeling of "shooting at faraway dots" commonly seen in flight games. In the game, it is named "Dogfight Mode" (DFM) for air-to-air battles and "Air Strike Mode" (ASM) for air-to-ground targets.[2] They are not optional, as certain planes and ground targets cannot be destroyed without CRA. To initiate DFM, the player taps LB+RB on the Xbox 360 or L2+R2 on the PS3 when they have gotten close enough to the plane they are targeting. ASM is initiated by pressing the same buttons at specific points around the map. Players will also pilot other aircraft types and assume other combat aviation functions; the game introduces the B-1 and B-2 strategic bombers and the AH-64 Apache and UH-60 Black Hawk helicopters as player-flyable vehicles. Certain missions may call for players to act as Black Hawk door gunners or weapons officers aboard the AC-130 Spectre gunship. Dogfight Mode has received numerous criticisms primarily from those who have played previous Ace Combat games, saying that it has ruined the core gameplay of the game and eliminated freedom of style.