U.S. Army Staff Sgt. Rolando Arnal, left, U.S. Navy Chief Warrant Two Steve Vargas, Contruction Electrician 2nd Class Vincent Karkau and U.S. Air Force Senior Airman Jacquelyn Ruffino, service members assigned to Naval Surface Warfare Center Corona Division, pour and finish sidewalks at Naval Weapons Station Seal Beach Detachment Norco, home of NSWC Corona. The sidewalks are being replaced after damage by tree roots and heavy equipment resulted in trip hazards.