 He also pushed other tactical innovations in aircraft markings and weapons employment that developed the P-47 into a superior aerial weapon.While under Zemke's command, the 56th FG claimed over 500 of the eventual 665.5 German aircraft the group was credited with destroying in World War II, and he himself claimed shot down 15.25 of those.He was twice awarded the Distinguished Service Cross while commanding the 56th in 1944, for the missions of February 11 (bomber escort to Frankfurt) and March 6 (Berlin escort).