MIL-M-63221A (NOTICE-2), DETAIL SPECIFICATION: MORTAR, 60MM: M224 (WITHOUT M64 SIGHT UNIT) (03-JUL-2003)
MIL-M-63221A (NOTICE-2), DETAIL SPECIFICATION: MORTAR, 60MM: M224 (WITHOUT M64 SIGHT UNIT) (03-JUL-2003).,
MIL-M-63221A remains inactive for new design, however, the
document is valid for use.