This terrific vid showed up on Forgotten Weapons this morning. This will be required viewing by all Rogues and anyone failing the quiz (yes, there will be a quiz) may have their weekend liberty revoked! This gun and its air-cooled sister, the M1919, were the standard machine guns of US forces right up until the Vietnam war. It should be noted that M2 "Ma Deuce" is essentially the same design, scaled up for the .50 BMG cartridge. When introduced late in WWI, the fantastic efficiency made an impression on US and allied forces alike. The gun could run for thousands of rounds with no stoppages, something quite unique in those days when machine guns were new to the world.