Keywords: Sikorsky HO5S Marines.jpg en A U S Marine Corps Sikorsky HO5S-1 BuNo 128618 of Marine Observation Squadron VMO-6 landing aboard a hospital ship s 1950 http //www flickr com/photos/sdasmarchives/6312663069/in/set-72157627928485093 San Diego Air Space Museum cc-zero Marine Observation Squadron 6 Sikorsky S-52 |