No. 423 Squadron RCAF was a World War II unit of the Royal Canadian Air Force. Formed in 1942 in Oban, Argyll, Scotland for General Reconnaissance duties, it later moved to RAF Castle Archdale, Northern Ireland where it flew Sunderland flying boat patrol bombers. It changed to a transport role in 1945 and was disbanded later that year. Re-formed in 1953 at RCAF Station St Hubert (now Montréal/Saint-Hubert Airport) flying the CF-100 in a continental defence role, it was transferred to RCAF Station Grostenquin in 1957 where it replaced No. 416 Squadron which flew Sabres. The squadron was again disbanded in 1962 when the RCAF's CF-100s were removed from service. In 1974, it was re-formed a final time as No. 423 Anti-Submarine Squadron. In 1995 its name was changed to 423 Maritime Helicopter Squadron. It flew CH-124 Sea King helicopter, which it used in support of Royal Canadian Navy (RCN) warships during the 1991 Gulf War and in the Arabian Sea after the 11 September 2001 terrorist attacks. It now operates the Sikorsky CH-148 Cyclone since January 2018.
Canadian Department of National Defence - Honours & Recognition for the Men and Women of the Canadian Armed Forces 10th Edition - 2016. Accessed 14 March 2019
2 Non-standard code as unit using OW added L. Letters normally denoted parent Command, aircraft type (L Liberator transport, D Dakota etc), unit, and individual aircraft.
3 VCXXA where VC was the civil code used by the RCAF replacing CF-, XX was the unit code and A was the aircraft ID letter
4 XXnnn where XX was the unit code and nnn was the last 3 digits of the serial number. Unit code was replaced with "RCAF" in 1958
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