Airman 1st Class Thomas Berthiaume and Senior Airman Aarron Hey, 90th Maintenance Operations Squadron Power, Refrigeration and Electrical, conduct maintenance practice on a missile lauch facility workcage maintenance stand on F.E. Warren Air Force Base, Sept. 11, 2014. Berthiaume and Hey practiced in preparation for their competition during the Air Force Global Strike Challenge. (U.S. Air Force photo by Lan Kim)