August 1971, largest cargo plane and first time to Vietnam. We provided eight hours of security on probably the hottest day of my tour. A1C McDonald (entry control,) A1C Clarrett (close boundary,) A1C Arechiga (close boundary.) Maintenance crew was supposed to be with us but the longest they could last was in stretches of fifteen minutes. The Maintenance Captain made sure we had anything we wanted to drink or eat.