The CH-3E is the USAF version of the Sikorsky S-61 amphibious transport helicopter developed for the U.S. Navy. The USAF initially operated six Navy HSS-2 (SH-3A) versions of the S-61 in 1962, eventually designating them CH-3A/Bs. They were so successful the USAF ordered 75, modified as CH-3Cs, featuring a new rear fuselage design with a ramp for vehicles and other cargo. The first CH-3C was flown on June 17, 1963. When 41 CH-3Cs were updated with more powerful engines in 1966, they were redesignated as CH-3Es. Forty-five more were newly manufactured. Later, 50 CH-3Es were modified for combat rescue missions with armour, defensive armament, self-sealing fuel tanks, a rescue hoist, and in-flight refuelling capability. They were redesignated HH-3Es and used extensively in Vietnam under the nickname "Jolly Green Giant."

SPECIFICATIONS
Main rotor diameter: 62 ft.
Fuselage Length: 73 ft. 0 in.
Height: 18 ft. 1 in.
Weight: 22,050 lbs. loaded
Armament: Provisions for two .50-cal. machine guns
Engines: Two General Electric T58-GE-5 turboshaft engines of 1,500 hp. each
Crew: Three
Cost: $796,000
Serial Number: 63-9676