A contractor working with the Army Corps of Engineers in Puerto Rico ensures the fuel filter is working properly on a generator, Jan. 14, 2018. The Corps’ temporary emergency power mission ensures federal generators in Puerto Rico are fully mission capable before they are installed at facilities across the island. If they fail any checks before installation or require maintenance that cannot be completed on site once installed, the generators are sent to a pier in San Juan for repairs. Army photo by Codi Kozacek