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9639 was one of 12 H-21Bs which started their RCAF service on 17 November, 1955, and one of six which was
still on strength at the unification of the Canadian Armed Forces in 1968 when it was redesignated as a
Vertol CH-125. '639 was loaned to Dominion Helicopters, based at Knob Lake, Quebec, and flown as CF-JJR
for a period for operations on the Mid-Canada Line. It was returned to the RCAF on 2 Septemer, 1965 and
continued to serve primarily in the Search and Rescue role until it was struck off strength along with the
remainder of the fleet on 12 January, 1972.
The H-21B (later to be reclassified the CH-125 after the integration of the Canadian Armed Forces) was more
commonly referred to by Air Force personnel as the Vertol or the "Flying Banana", a reference to its enlongated
and curved shape. '641 was the only H-21B to serve with No. 102 Communications and Rescue Unit operating out
of RCAF Station Trenton, Ontario, however, when the Unit was redesignated as 424 C&R Squadron at CFB Trenton,
Ontario '639 was also on strength as the assets of 104 and 131 Composite Units had just been been transferred
to 424 Squadron.