On May 20, 1941, Germany began its airborne invasion of Crete.
"Aftermath
In the fighting for Crete, the Allies suffered around 4,000 killed, 1,900 wounded, and 17,000 captured. The campaign also cost the Royal Navy 9 ships sunk and 18 damaged. German losses totaled 4,041 dead/missing, 2,640 wounded, 17 captured, and 370 aircraft destroyed. Stunned by the high losses sustained by Student's troops, Hitler resolved never to conduct a major airborne operation again. Conversely, many Allied leaders were impressed by the airborne's performance and moved to create similar formations within their own armies. In studying the German experience in Crete, American airborne planners, such as Colonel James Gavin, recognized the need for troops to jump with their own heavy weapons. This doctrinal change ultimately aided American airborne units once they reached Europe."