This model is a version of S-56 H-37
Helicopter Sikorsky H-37A Mojave Serial 56-139 Register 58-994 used by US Army Aviation. Built 1959. Aircraft history and location
| US Army Aviation |
|1959-11-18||Sikorsky S-56, c/n 56-139, ff:?|
del US ARMY as H-37A, 58-994, 18Nov59
redesig CH-37A, Oct 62
conv CH-37B, unk
wfu & soc unk.