Staff Sgt. Yuxiong Liang, 36th Medical Operations Squadron dental lab technician, pours investment, or liquid stone, at a slow pace to let air out to ensure bubbles aren’t trapped in a final crown mold May 11, 2015, at Andersen Air Force Base, Guam. The dental clinic here consists of three elements – support, clinical and a dental lab. (U.S. Air Force photo by Airman 1st Class Joshua Smoot/Released)