Navy Lt. Cmdrs. Matthew Mattivi, left, and Mark Christensen, discuss operations during a training exercise at Camp Shelby, Miss., Aug. 21, 2018. Mattivi is the executive officer assigned to Naval Mobile Construction Battalion 133. During the exercise Seabee forces plan and execute multiple mission tasks including convoy security, force protection and camp buildup before a deployment. Navy photo by Petty Officer 2nd Class George M. Bell