ATC may refer to: Medicine. Acute traumatic coagulopathy. Anaplastic thyroid cancer, a form of thyroid cancer. Anatomical Therapeutic Chemical Classification System, a WHO drug classification system. Certified athletic trainer, post-nominal letters. Organizations. Military. Air Training Command, the predecessor to Air Education and Training Command in the United States Air Force. Air Training Corps, United Kingdom, for cadets. Air Transport Command, a United States Army Air Force command during World War II. New Zealand Air Training Corps, for cadets. Education.
https://en.wikipedia.org/wiki/ATC