180822-N-ZI635-646 CAMP SHELBY, Miss. (Aug. 22, 2018) Builder Constructionman Leo Tyler defends a helicopter landing zone during Naval Mobile Construction Battalion (NMCB) 133's field training exercise (FTX) at Camp Shelby, Miss. FTX provides a robust training environment where Seabee forces plan and execute multiple mission essential tasks including convoy security, force protection, and camp buildup prior to deployment. (U.S. Navy photo by Mass Communication Specialist 2nd Class George M. Bell/Released)