Its predecessor, the AF-2 Guardian was the first purpose-built aircraft system for ASW, using two airframes, one with the detection gear, and the other with the weapons.
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Initial production run of anti-submarine warfare aircraft for Canada based on S2F-1. 42 built by De Havilland Canada.
CP-121
New designation given to all CS2F-1, -2, and -3 aircraft following unification of Canadian military in 1968.