[1] Höcker began his military service as a Fahnenjunker (officer candidate) on 26 February 1912 in the Infanterie-Regiment „Graf Bülow von Dennewitz“ (6.

[1] With the start of World War I, Höcker deployed with his regiment to the Western Front, first seeing action in the Battle of Liège.

[1] With the mobilization for World War II, Höcker was given command of the newly-formed Infanterie-Regiment 487.

Höcker was transferred to the Führerreserve (Leaders Reserve) on 1 October 1943, and named commander of the 17th Luftwaffe Field Division on 5 November 1943.

He was named commander of the newly formed 167th Volksgrenadier Division on 17 October 1944.