Staff Sgt. Andrew Bracken, a firefighter from the 175th Wing, Maryland National Guard, reloads a nail gun to prepare material that will help shape the concrete floor of a warehouse April 12, 2016 at Andersen Air Force Base, Guam. The 175th CES is the first of seven National Guard groups that will be working toward the completion of this project. (U. S. Air National Guard Photo by Airman 1st Class Enjoli Saunders/RELEASED)