Petty Officer 2nd Class Jacob Tester shows Petty Officer 3rd Class Alejandro Lopez how to place a tourniquet properly during Combat Lifesaver training here in Camp Leatherneck. NMCB 3 is deployed to Southern Afghanistan to provide construction and engineering support to the region. NMCB 3 is part of the Navy Expeditionary Combat Command's warfighting support elements, providing construction operations and security in support of overseas contingency operations.