Colt-Browning M1895/14 machine gun
Designed by John M. Browning c.1889-95 and made by Colt Manufacturing Co. c.WW1.
.30-06 caliber, belt-fed, lever-actuated gas-operated automatic fire, air-cooled finned barrel.
An early machine gun design, and a sexy one at that. The Colt-Browning “potato digger” was the first reliable gas-operated rapid-fire gun to see military service, starting in the Spanish-American war.
This make the US Navy the earliest example of armed forces not seeing a problem with gas operated machine guns compared to recoil operated ones, a demographic also known as “not the German army until the 50′s”.