The principles of coordinating small surface boat rescue efforts with direction and assistance from air units were developed in the 1930s in Germany. In 1935, Lieutenant Colonel Konrad Goltz of the German Air Force (Luftwaffe), a supply officer based at the port of Kiel, was given the task of organizing the Seenotdienst (Sea Rescue Service), an air-sea rescue organization focusing on the North Sea and the Baltic Sea. Goltz gained coordination with aircraft units of the Kriegsmarine as well as with civilian lifeboat societies.[12]