[1]: 32 Grosshuesch enlisted in the United States Army in January 1942 and was assigned to the Quartermaster Corps.

He was assigned to the 439th Fight Squadron at Dale Mabry Field converting to fly the P-47 Thunderbolt.

Multiple sources state that on 30 July Grosshuesch was credited with single-handedly sinking an Imperial Japanese Navy (IJN) Destroyer off Goto Retto island.

[3] After serving occupation duty in Japan, Grosshuesch returned to the U.S. in August 1946 and was assigned to the 61st Fighter Squadron at Selfridge Field.

In July 1954, Grosshuesch was given command of the 452nd Fighter-Day Squadron at Foster Air Force Base flying F-86 Sabres.

In July 1964, Grosshuesch was assigned to South Vietnam where served as commander of the Special Air Operations Group.