The Messerschmitt Me-163 rocket fighter aircraft, perhaps better known as the Komet, was possibly the most radical German manned fighter aircraft design to actually enter the WW II combat theatre. Here Me-163 Komet fighters of the Luftwaffe climb vertically through an 8th Air Force bomber formation and its top fighter cover before swooping down on the heavies for their short but often deadly attack. 

Signed by four Me-163 pilots:
Captain Otto A. Boehner
Sergeant Rolf "Bubi" Glogner
Sergeant Kurt Schiebeler
First Lieutenant Adolf Niemeyer.