The five-inch forward-firing aircraft rocket or FFAR was an American rocket developed during World War II for attack from airplanes against ground and ship targets.
They had a 3.5-inch diameter and a non-explosive warhead, since they were used as an aircraft-launched anti-submarine warfare (ASW) rocket and worked by puncturing the hull.
It was accurate enough for use against surface ships and land targets, but these missions required an explosive warhead.
[2] The high-velocity aircraft rocket, or HVAR, was developed to fix this flaw.
[2] The FFAR was used by the Douglas SBD Dauntless (dive bomber), the Grumman TBF Avenger (torpedo bomber) and the Vought F4U Corsair (carrier based fighter).