[2] From 1990 to 1998, Gerhartz served as part of Fighter Wing 71 (Jagdgeschwader 71), operating the F-4F Phantom II, and stationed at Wittmundhafen Air Base.

[2] From 2000 to 2003, Gerhartz commanded the flying group of Fighter Wing 73 (Jagdgeschwader 73), operating the MiG-29 Fulcrum at Laage Air Base.

During this time, he deployed to Camp Marmal, Afghanistan, as part of NATO's International Security Assistance Force (ISAF) mission.

[5] On 18 August 2020 Israeli and German planes flew in joint formation above the concentration camp memorial place in Dachau and above Fürstenfeldbruck, the latter being the site of the 1972 Olympia attack.

[8] In 2024, Gerhartz was one of the participants in an insufficiently secured web conference on the potential provision of Taurus missiles to Ukraine and the presence of US and UK military personell in that theatre or war, which was intercepted and leaked by Russia.