The first U.S. helicopter is shot down in Vietnam. It was one of 15 helicopters ferrying South Vietnamese Army troops into battle near the village of Hong My in the Mekong Delta. The first U.S. helicopter unit had arrived in South Vietnam aboard the ferry carrier USNS Core on December 11, 1961. This contingent included 33 Vertol H-21C Shawnee helicopters and 400 air and ground crewmen to operate and maintain them. Their assignment was to airlift South Vietnamese Army troops into combat.