This model is a version of S-56 H-37
Helicopter Sikorsky H-37A Mojave Serial 56-138 Register 58-993 used by US Army Aviation. Built 1959. Aircraft history and location
| US Army Aviation |
|1959-10-10||Sikorsky S-56, c/n 56-138, ff:?|
del US ARMY as H-37A, 58-993, 10Oct59
redesig CH-37A, Oct 62
conv CH-37B, unk
wfu & soc unk.