The .30 cal water-cooled browning is a heavy machine gun designed by John M. Browning throughout the early 1900’s. First introduced in 1917, the United States armed forces used it in WWI, WWII, and the Korean War and was used in service until the late 1960’s. It was a crew-served, belt-fed, water-cooled machine gun that was used as a battalion level, and often mounted on vehicles (such as a jeep).
The water cooling system surrounded the barrel with water which then turned to steam when heated.The steam was moved off via tube that allowed for the water to be re-used.