Göring's control over all aspects of aviation became absolute. On 25 March 1933 the German Air Sports Association absorbed all private and national organizations, while retaining its 'sports' title. On 15 May 1933, all military aviation organizations in the RLM were merged, forming the Luftwaffe; its official 'birthday'.[13] The National Socialist Flyers Corps (Nationalsozialistisches Fliegerkorps or NSFK) was formed in 1937 to give pre-military flying training to male youths, and to engage adult sport aviators in the Nazi movement.