Task Force Diamondback duration staff member U.S. Air Force Staff Sgt. Tim P. Stafford, 165th Airlift Wing, gives U. S. Army Private First Class Amanda J. Skroch, from the 188th Engineer Company, a few pointers on arch welding on the United States side of the of the primary steel border fence at the United States-Mexico border June 7, 2007. The high steel fence runs between the cities of San Luis, Arizona, and San Luis Rios Colorado, Mexico. The joint force mission of Task Force Diamondback, under Operation JUMP START, is to erect and reinforce segments of border fence and to construct obstacles along the border to help secure the southwest United States-Mexico border. (USAF photo/SMSgt. David Lipp)