 In 1967, the 20th was joined by the Bell UH-1 Huey helicopters formerly assigned to Project Lucky Tiger and the Hueys became known as the "Green Hornets".The "Green Hornets" supported Special Operations in South Vietnam and Cambodia.In August 1969 the Pony Express CH-3E's were transferred to the 21st Special Operations Squadron at Nakhon Phanom Royal Thai Air Force Base, and the Pony Express ceased to exist.