Sikorsky LH-34D (S-58) 'Seabat'

The Sikorsky S-58 was ordered by the military and designated the H-34. It was first used in a anti-submarine role by the U.S. Navy with the first flight in 1954. The U. S. Army used the H-34 (known as the “Choctaw”) as its principal transport helicopter from 1955 through 1964. The Marines adopted it in 1957 (known as the “Seahorse”) as their standard troop carrier for "vertical envelopment" landings, operating from carriers.