The Apache is the main ground support helicopter for United States ground combat forces fighting in Europe. It can be notably seen in "Goalpost". It also provides support in "Iron Lady" and "Scorched Earth". In Multiplayer, the Apaches are the helicopters in the Strafe Run killstreak of every faction, even if the "enemy" factions should be using Mi-28s.
The Apache's nose has a shark-mouth decal painted on it.
The AH-64's 30mm chaingun revolves like a minigun. This is likely because the chaingun uses the same animation as the guns on the Harrier, Pave Low, and other gunships in the game.
All announcers have voice-acted lines announcing to the player an Apache is waiting for deployment, even the OpFor, Militia, and Spetsnaz.
In the mission Goalpost if the player doesn't destroy the two Havocs while on the gunner on the M1 Abrams, two Apaches come along and destroy them using their rockets. Other Apaches are seen shooting down several Russian helicopters throughout the mission.
Apaches are piloted by two copies of Pelayo from Call of Duty 4, same goes for the Havoc.
The Apaches used in the Strafe Run killstreak are missing their landing gear, as do the ones in the icon.
In Modern Warfare 3, two variants of the Apache exist: The Modern Warfare 2 variant is used in campaign, while the cut Call of Duty 4 variant (evident by its lack of shark teeth, lower quality textured model and a FCR dome over the main rotor) is used as the Strafe Run killstreak.