In 1994, the U.S. military officially accepted the XM4 into service as the M4 carbine to replace M16A2s in certain roles. The M4 carbine has also replaced most submachine guns and selected handguns in U.S. military service, as it fires more effective rifle ammunition that offers superior stopping power and is better able to penetrate modern body armor. The United States Marine Corps has ordered its officers (up to the rank of Lieutenant Colonel) and staff non-commissioned officers to carry the M4 carbine. United States Navy corpsmen E5 and below are also issued M4s. M4s are fielded by troops in positions where a full-length rifle would be too bulky, including vehicle operators and fireteam and squad leaders. As of 2013, the U.S. Marine Corps had 80,000 M4 carbines in their inventory.
This assault rifle is a well rounded weapon, excelling at short and medium range combat. It has three fire modes: Full auto, burst, and single shot. It can down a enemy in three shots. It comes with a M203 Grenade Launcher.
Conflict: Desert Strom
The M4A1 appears as the "M16 Colt Silenced Sub-machine Gun" and is used by the team leader/rifleman during stealth missions. This is partially anachronistic because even though experimental versions of the M4 existed at the time, none were known to have been issued during the Gulf War and it wasn't officially adopted until 1994.
Conflict: Global Terror
Bradley's primary weapon in Colombia and Korea is the M4A1 with an underslung M203 grenade launcher. It is also used by "terrorists" during training and Blue Team in Korea.