Meanwhile, to enable its students to acquire a thorough knowledge of the environment in which the air transport takes place, ENAC seeks to develop cooperation with the "École nationale de la météorologie". A report dated 29 May 1950 invokes the obvious implications of meteorology in the air traffic and promotes the training of this topic for air traffic controllers. Also, close links traditionally existed between the civil aviation and the Air Force. After World War II, as the civil aviation was developing, members of the armed forces took part in its expansion. A lot of pilots, but also radios, navigators and mechanics came from the army to airlines. ENAC seeks to be part of this movement, and help the conversion of military aircrew. It is in this spirit that was signed on 9 June 1951 a memorandum specifying its duties in the training of military pilots for civil aviation. The university is the general contractor of the operations and provides theoretical training. The "Service de l'aviation légère et sportive" (SALS), under the decree of 31 March 1951, is providing for free the flight training for airline pilots candidates coming from the army.