Max Ibel, Anton Mader and Hermann Graf

1. Officers from 1. Jagdkorps on exercise in Zeist, Holland, December 1943. They were all Tagjäger (Day Fighter). At least three of them are wearing the Ritterkreuz in their neck, from left to right: Oberst Max-Josef Ibel (Kommandeur 2. Jagd-Division. Ritterkreuzträger), Oberstleutnant Anton Mader (Stabsoffizier 1. Jagdkorps. 86 victories. Ritterkreuzträger), and Major Hermann Graf (Geschwaderkommodore Jagdgeschwader 11. 212 victories. Brillantenträger).

Source :
https://www.surreymilitaria.com/en-GB/wwii-german-photographs-and-ephemera/1-jagdkorps-war-game-photo-with-knights-cross-winners/prod_10483#.YKCIqt0xXct