The McGuire rig was used to extract soldiers from the jungles of Vietnam. It would be suspended from a helicopter and used to extract soldiers from areas without a suitable pick-up zone. It was simple, inexpensive, and effective. Although less comfortable than the STABO (Short Tactical Air Borne Operations) harness, it did not require the soldier to carry any special equipment. It was designed by Sergeant Major Charles T. McGuire, a member of Project DELTA, a Special Forces reconnaissance project.