Helicopter Sikorsky HR2S-1 Serial 56-099 Register 145864 used by US Marine Corps USMC. Built 1958. Aircraft history and location Aircraft History 145864 US Marine Corps 1958-09-08Sikorsky S-56, c/n 56-099, ff:? del USMC as HR2S-1, 145864, 08Sep58 pres US Naval Aviation Museum, NAS Pensacola, FL, unk. 1968-04-30soc 30apr68 Send Updates Use APP to upload photo @ (optional) When Now? / / Send