HH-3E Jolly Green GiantSikorsky HH 3E Jolly Green Giant helicopter model. The Sikorsky CH 3E was 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