Description thumb|left|alt=dummy ASROC round in IJN service|Dummy ASROC round The first ASROC system using the MK-112 "Matchbox" launcher was developed in the 1950s and installed in the 1960s. This system was phased out in the 1990s and replaced with the RUM-139 Vertical Launch ASROC, or "VLA".
Description thumb|left|alt=dummy ASROC round in IJN service|Dummy ASROC round The first ASROC system using the MK-112 "Matchbox" launcher was developed in the 1950s and installed in the 1960s This system was phased out in the 1990s and replaced with the RUM-139 Vertical Launch ASROC, or "VLA".