U.S. Air Force Airman William Petrick, 757th Aircraft Maintenance Squadron aerospace propulsion apprentice, looks over a F-15E Strike Eagle during the U.S. Air Force Weapons School mission employment exercise, Dec. 6, at Nellis Air Force Base, Nev. The two-week-long mission employment phase is the final part of a five-and-a-half-month Weapons School graduate course that showcases the students newly acquired skills to test their ability to plan, execute and lead complex missions.