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A piston-engined CH-37 Mojave lifting the prototype of the tracked T92 or T101 Armored Reconnaissance Airborne Assault vehicle (AR/AAV) with a 106mm recoilless rifle (combat favorite) in the 1950s

At the time of its introduction, the Sikorsky S-56 was the largest and fastest military helicopter in the Western world. In 1956, the helicopter set two height-with-payload world records and one world speed record. The S-56 was also Sikorsky’s first multi-engined helicopter and remains the largest piston-engined helicopter ever built.
https://oldmachinepress.com/2012/09/04/sikorsky-s-56-ch-37-mojave/

Hm, never seen this chopper before... Thanks for introducing.

I think there is one at the air museum in McMinnville Oregon.