MIL-R-27521A (NOTICE-1), MILITARY SPECIFICATION: RECEPTACLE, FLYING BOOM, AERIAL REFUELING, GENERAL SPECIFICATION FOR (25-AUG-1989)
MIL-R-27521A (NOTICE-1), MILITARY SPECIFICATION: RECEPTACLE, FLYING BOOM, AERIAL REFUELING, GENERAL SPECIFICATION FOR (25-AUG-1989).