SAND SIFTING U.S. Army Pfc. Abel Scott, left, Pfc. Wayne Paliwoda, center, and Pvt. Michael Culver, right, sift material to make concrete at a Santa Librada, Panama, elementary school, June 26, 2010. Scott, Paliwoda, and Culver are construction engineers assigned to the 372nd Engineer Company. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 934060-X-STB71-740.jpg Photo Gallery