Airman 1st Class Zachary Sheller, 374th Civil Engineer Squadron electrical power plant journeyman, checks an arresting gear at Yokota Air Base, Japan, June 1, 2017, during an annual certification test of the Aircraft Arresting System. Airmen from the 374 CES and 374th Operations Support Squadron are responsible for setting up the system and logging any deficiencies during the test. (U.S. Air Force photo by Yasuo Osakabe)