Iron Airman Challenge Published Oct. 20, 2014 By Airman 1st Class Sahara L. Fales Minot Air Force Base Public Affairs MINOT AIR FORCE BASE, N.D. -- Airmen participate in the Iron Airman Challenge on Minot Air Force Base, N.D., Oct. 10, 2014. The IAC is a test that consists of four events: push ups, sit ups, pull ups and a two-mile run. In order to be named an Iron Airman, all four events must be completed in less than 30 minutes.