The remainder of IET consists of Advanced Individual Training (AIT), where you train in your specific career field. Each Military Occupational Specialty (MOS), or US Army career, has a different school that will give each recruit the training needed to succeed in the tasks for that particular job. AIT courses vary in length a great deal; they can last anywhere from 6 to 52 weeks. Despite the focus changing to a more instructional format, recruits are still continually tested for physical fitness and weapons proficiency. You also continue to be subject to the same duties, strict schedule, rules, and discipline as in BCT.