Airman 1st Class Manuel Jimenez, 554th RED HORSE Squadron engineering assistant apprentice, tests the consistency and workability of concrete Sept. 18, 2013, at the mock runway training area on Northwest Field, Guam. The 554th RHS is constructing 12 projects at Northwest Field to support the Silver Flag exercise’s initial operating capabilities when they relocate here from Kadena Air Base, Japan. (U.S. Air Force photo by Senior Airman Marianique Santos/Released)