The M1 and M2 carbines were again issued to U.S. forces during the Vietnam War, particularly with United States Air Force Security Police and United States Army Special Forces.
These weapons began to be replaced by the M16 in 1964, and they were generally out of service by 1970s, although they were used in limited numbers by U.S. troops and security personnel until the fall of Saigon in 1975.

At least 793,994 M1 and M2 carbines were given to the South Vietnamese and were widely used throughout the Vietnam War.
 A number were captured during the war by Vietcong with some made compact by shortening the barrel and/or stock. "
While the carbine's lighter weight and high rate of fire made it an excellent weapon for small-statured Asians, these guns lacked sufficient hitting power and penetration, and they were eventually outclassed by the AK-47 assault rifle."

The M1/M2/M3 carbines were the most heavily produced family of U.S. military weapons for several decades.
They were used by every branch of the U.S. Armed Forces.
The M1 and M2 carbines were again issued to U.S. forces during the Vietnam War, particularly with United States Air Force Security Police and United States Army Special Forces. These weapons began to be replaced by the M16 in 1964, and they were generally out of service by 1970s, although they were used in limited numbers by U.S. troops and security personnel until the fall of Saigon in 1975.
At least 793,994 M1 and M2 carbines were given to the South Vietnamese and were widely used throughout the Vietnam War.  A number were captured during the war by Vietcong with some made compact by shortening the barrel and/or stock. "While the carbine's lighter weight and high rate of fire made it an excellent weapon for small-statured Asians, these guns lacked sufficient hitting power and penetration, and they were eventually outclassed by the AK-47 assault rifle."
The M1/M2/M3 carbines were the most heavily produced family of U.S. military weapons for several decades. They were used by every branch of the U.S. Armed Forces.
M1 carbine