A contractor member from Sanwa Engineering Company, Limited explains the progress of the project to Major Korinne Takeyama, 374th Civil Engineer Squadron operations flight commander, at Yokota Air Base, Japan, April 8, 2017. The 374th Civil Engineer Squadron along with contractors repaired the gas leak from one of the gas-insulated high-voltage switchgear in the West Substation to prevent further damage. (U.S. Air Force photo by Machiko Arita)