September 3, 2010: Britain has joined the U.S. Navy and Marines and installed the GAU-21 machine-gun system for their heavy helicopters. Thus Britain is equipping its Sea King commando helicopters ...
The M3M flexible machine gun has been adopted by USN under the designation GAU-21/A for use on helicopters. The GAU-21/A is also being used by the United States Marine Corps to upgrade from the XM218 ...
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