Career
He reached the rank of Vizeadmiral (vice admiral), serving as the first chief of the Navy Office, and as commander of Naval Forces Baltic Approaches for North Atlantic Treaty Organization. Obermaier began his education in the German merchant marine in 1931, and twice circumnavigated twice Cape Horn in a sailing ship. In 1933, he joined the new Kriegsmarine of Nazi Germany. During World World War II, he was an officer in fast attack craft units, reaching the rank of Korvettenkapitän (lieutenant commander).
From March 1941 to July 1944, he commanded the 6th Fast Attack Craft Flotilla (German: 6 Schnellbootsflottille), which was used in the North Sea and the English Channel.
After the war he worked as a sales representative, and served as an advisor to the Egyptian Navy. In 1956, Obermaier joined the new Bundesmarine.
Initially, he served at the Federal Ministry of Defence. In 1959, he was made head of the command responsible for commissioning of naval craft, and in 1960 he became the first commander of Zerstörer 5 (the former United States Navy destroyer Dyson), which he led until the end of 1961.
In January 1964, he was promoted to Flottillenadmiral (flotilla admiral) and made commander of the Naval Command North Sea (German: Marineabschnittskommando Nordsee).
In October 1964, Obermaier was promoted to Konteradmiral (rear admiral), and made commander of Naval Central Command (German: Zentrales Marinekommando), serving until September 1965. In March 1966, he was appointed the first head of the Navy Office. In October 1968, Obermaier was promoted to Vizeadmiral (vice admiral) and took up the command of Commander, Naval Forces Baltic Approaches, based at Karup in Denmark.
He served in this position until his retirement in 1971.