MIL-STD-1551C, MILITARY SPECIFICATION: QUALITY CONTROL OF GASEOUS AND LIQUID AVIATOR'S BREATHING OXYGEN AT AIRCRAFT CONTRACTOR FACILITIES (28 OCT 1997) [NO S/S DOCUMENT].,MIL-STD-1551C (USAF), dated 1 April 1990, is hereby canceled without replacement. The technical information in this standard may be found in Technical Order42B6-1-1 which may be useful in determining or evaluating requirements.