Keywords: HR2S Marines debarking NAN11-57.jpg Marines debarking from a Sikorsky HR2S-1 helicopter In 1962 it was redesignated CH-37C U S Navy Naval Aviation News January 1957 http //www history navy mil/nan/backissues/1950s/1957/Jan57 pdf 1956 USN PD-USGov-Military-Navy H-37 Mojave Aircraft nose loading doors Aircraft of the United States Marine Corps |