programs: Basic Officer Training (BOT), which is for officer candidates for the Regular Air Force and the Air Force Reserve; and the Academy of Military Science (AMS), which is for officer candidates of the Air National Guard. The Air Force also provides Commissioned Officer Training (COT) for officers of all three components who are direct-commissioned into medicine, law, religion, biological sciences, or healthcare administration. COT is fully integrated into the OTS program and today encompasses extensive coursework as well as field exercises in leadership, confidence, fitness, and deployed-environment operations. Air Force Fitness Test The US Air Force Fitness Test (AFFT) is designed to test the abdominal circumference, muscular strength/endurance and cardiovascular respiratory fitness of airmen in the USAF. As part of the Fit to Fight program, the USAF adopted a more stringent physical fitness assessment; the new fitness program was put into effect on 1 June 2010. The annual ergo-cycle test which the USAF had used for several years had been replaced in 2004. In the AFFT, Airmen are given a score based on performance consisting of four components: waist circumference, the sit-up, the push-up, and a run. Airmen can potentially earn a score of 100, with the run counting as 60%, waist circumference as 20%, and both strength tests counting as 10% each. A passing score is 75 points. Effective 1 July 2010, the AFFT is administered by the base Fitness Assessment Cell (FAC), and is required twice a year. Personnel may test once a year if he or she earns a score above a 90%. Additionally, only meeting the minimum standards on each one of these tests will not get you a passing score of 75%, and failing any one component will result in a failure for the entire test. Aircraft inventory The U.S. Air Force has a total force of 5,217 aircraft as of June 2021. Of these, 4,131 are in active service. Until 1962, the Army and Air Force maintained one system of aircraft naming, while the U.S. Navy maintained a separate system. In 1962, these were unified into a single system heavily reflecting the Army and Air Force method. For more complete information on the workings of this system, refer to United States military aircraft designation systems. The various aircraft of the Air Force include: A – Attack The attack aircraft of the USAF are designed to attack targets on the ground and are often