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What does HAPDB stand for?

HAPDB stands for High Altitude Precision Daylight Bombing

This definition appears very rarely

Samples in periodicals archive:

Air Force photo) Download HiRes The Sandman during the raid on the oil refinery at Ploesti, Romania. Download HiRes Raid on oil refinery at Ploesti, Roumania, WWII. Download HiRes Prior to World War II, the U. S. Army Air Corps (Army Air Forces as of June 20, 1941) developed a doctrine of high-altitude, precision, daylight, massed bombing.