MIL-L-25971B (AMENDMENT-1), MILITARY SPECIFICATION: LIGHT, AIRPORT TRAFFIC CONTROL, SDU-4/U (27-JAN-1984) [SUPERSEDED BY MIL-DTL-25971C]
MIL-L-25971B (AMENDMENT-1), MILITARY SPECIFICATION: LIGHT, AIRPORT TRAFFIC CONTROL, SDU-4/U (27-JAN-1984) [SUPERSEDED BY MIL-DTL-25971C].