MIL-HDBK-421 (NOTICE 1), MILITARY HANDBOOK: COMMUNICATIONS TIMING AND SYNCHRONIZATION SUBSYSTEMS (22 DEC 2000)

MIL-HDBK-421 (NOTICE 1), MILITARY HANDBOOK: COMMUNICATIONS TIMING AND SYNCHRONIZATION SUBSYSTEMS (22 DEC 2000)., MIL-HDBK-421, dated 17 May 1991, has been reviewed and determined to be valid for use in acquisition.