Showing a considerable advancement from its earlier designs, Sikorsky's H-5 helicopter gained its greatest fame during the Korean War when it was called upon repeatedly to rescue pilots shot down behind enemy lines and to evacuate wounded personnel from frontline areas. More than 300 were built, with this one being ferried form Elgin AFB, FL to Patterson Field for the USAFM in March 1955

I find it really fascinating to see these old helicopters/aeroplanes and to understand how the types in service today have evolved from them. The boom in helicopter development is particularly interesting as the rapid advances post-WWII quickly opened up possibilities that couldn't be contemplated previously. The improved capabilities of the H-5 became extremely useful during the Korean War for the timely rescue of downed pilots and for Medevac missions.