MIL-C-63990B (AMENDMENT-1), MILITARY SPECIFICATION: CARTRIDGE 5.56mm, TRACER, M856 (25-SEP-1991) [S/S BY MIL-DTL-63990D (CONTROLLED DISTRIBUTION)]
MIL-C-63990B (AMENDMENT-1), MILITARY SPECIFICATION: CARTRIDGE 5.56mm, TRACER, M856 (25-SEP-1991) [S/S BY MIL-DTL-63990D (CONTROLLED DISTRIBUTION)].