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Today in World War II History—April 23, 1944

Sikorsky YR-4B at NACA Langley Memorial Aeronautical Laboratory, Hampton, VA, 29 March 1945 (NASA photo)

Sikorsky YR-4B at NACA Langley Memorial Aeronautical Laboratory, Hampton, VA, 29 March 1945 (NASA photo)

75 Years Ago—April 23, 1944: Countdown to D-day: Air Plan for Operation Overlord is issued.

US Sixth Army secures Hollandia, New Guinea.

A helicopter is used for combat air rescue for the first time—a Sikorsky YR-4B helicopter of the US 1st Air Commando Group rescues four downed airmen in the Burma jungle, two at a time.