Airman 1st Class Mathew Crozier, 11th Civil Engineer Squadron structural apprentice, left, assists Fabian Moore, welder, as he welds a metal bar in place on Joint Base Andrews, Md., Feb. 13, 2019. For some projects, two welders are required, one to hold pieces in place while the other welds it. (U.S. Air Force photo by Airman 1st Class Noah Sudolcan)