170519-N-XJ502-022 FORT HUNTER LIGGETT, Calif. (May 20, 2017) Seabees assigned to Naval Mobile Construction Battalion (NMCB) 4 assemble the Mabey Johnson Bridge during NMCB-4’s field training exercise. The exercise tests the battalion’s ability to enter hostile locations, build assigned construction projects and defend against enemy attacks using realistic scenarios while being evaluated by Naval Construction Group 1. (U.S. Navy photo by Utilitiesman 2nd Class Jasmine Flores/Released)