Airmen from the 49th Civil Engineer and Materiel Maintenance Squadrons line up for weapon issue during a Bivouac exercise April 10. The Airmen donned full protective measures, including a Kevlar vest, helmet, and M-16 assault rifle, and assumed roles at defensive fighting positions and entry control points around the perimeter of a deployment training site, during the four-day exercise. (U.S. Photo by Airman 1st Class Michael Shoemaker/Released)