Air Cadets: MS of young man explaining, using model of Mosquito and Spitfire, blackboard in background. MS of officer explaining with model of airplane, air cadets sitting in foreground. Front MS of air cadets sitting in class. MS of cadet putting gas mask as Royal Canadian Air Force officer lieutenant explains its use. Various shots in classroom showing officers explaining uses of wireless radio, machine gun, of cadets being shown how to make slings for broken arms. HAMS of cadets at work on model planes around table. Front MSs of air cadets brass band on parade, marching towards and past camera. HAMSs of cadets presenting arms. CU of cadet presenting arms.