Construction Electrician 2nd Class Ross Davis, assigned to Naval Mobile Construction Battalion 15, tightens a drill-bit attachment as he participates in water well training. NMCB 15 is currently mobilized in support of Operation Enduring Freedom and is an expeditionary element of U.S. naval forces that support various units worldwide through national force readiness, civil engineering, humanitarian assistance and building and maintaining infrastructure. (U.S. Navy photo by Mass Communication Specialist 2nd Class Daniel Garas/Released)