Airman Leadership School (ALS) is a 24 duty day (5 week) United States Air Force program designed to develop airmen into effective front-line supervisors. It is the first professional military education that enlisted Air Force members encounter.[1] ALS focuses on developing leadership abilities, the profession of arms, and building effective communication. ALS was established in the 1990s, replacing the Non-commissioned Officer (NCO) Preparatory Course and NCO Leadership School.[2]