The Browning M2, or "Ma Deuce" as known by the troops, is the most proliferous heavy machinegun of the Cold War, with a service time of nearly half a century across the entire globe. Although originally designed as an anti-air and anti-tank weapon, it was soon found to be most effective at turning infantry to mush.
The AN/M3 is a fast-firing variant of the Browning M2, capable of firing at 1200 RPM, developed for use by aircraft and helicopters. It is otherwise mechanically identical.