Builder 2nd Class Eric Serrano, assigned to Naval Mobile Construction Battalion (NMCB) 15, works on a critical project for Regional Command South. 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)