There are three major versions of HF-2 in service. The first to enter service is the ship-based HF-2, with 2 twin box launcher on destroyer DD-915 first as a trial vessel. Later all major surface combatant in RoCN, except the Knox, were equipped with 2 quad-launchers, plus the 7 WWII era Gearing DDGs that was upgraded to WC3 standard, from the late 1980s to mid-1990s, had added a 1 quad-launcher by mid-1990s to give those air defense ships an anti-surface ability.