The purpose of the Reserve Officers’ Training Corps (ROTC) is to prepare young men and women to serve in the military. ROTC offers scholarships in each branch—Army, Navy, Air Force, Marines and Coast Guard—although scholarship requirements are different for each. But all ROTC scholarships allow you to go to school first (rather than serve in the military before receiving tuition aid), and require you to take ROTC coursework for credit. After you finish college, you must complete a period of service in the military.
Air Force: http://www.afrotc.com/