MIL-M-21188A (NOTICE 1), MILITARY SPECIFICATION: MIRROR ASSEMBLY, CONCAVE GROUND GLASS, OPTICAL LANDING SYSTEM (13 JAN 1989) [NO S/S DOCUMENT]

MIL-M-21188A (NOTICE 1), MILITARY SPECIFICATION: MIRROR ASSEMBLY, CONCAVE GROUND GLASS, OPTICAL LANDING SYSTEM (13 JAN 1989) [NO S/S DOCUMENT]., MU-M-21188A, dated 26 April 1972, is hereby cancelled without replacement.