Canadian Forces Auxiliary Vessel (CFAV) Cougar (YAG 308) was one of ten wooden YAG 300 (Yard Auxiliary, General) vessels built for the Royal Canadian Navy (RCN) between 1953 and 1955.

Built for use as auxiliary craft, Cougar primarily served as an at-sea training platform for junior naval officers, boatswains, reserve personnel and Sea Cadets at Canadian Forces Base (CFB) Esquimalt.

[3] Like other YAG 300 vessels, Cougar was 75′ long overall, 18′6″ wide, had a draft of 4′6″, measured 70 tonnes, and was powered by twin 6-71 Detroit Diesel engines.

Above the wheelhouse was an open bridge, fitted with a chart table and a gyrocompass repeater.

Re-designated as YFP 308 (Yard Ferry, Personnel) in 1960, she was transferred to reserve status due to defence budget cuts.