Lieutenant Commander (CMDR) Brant D. Pickrell, Commanding Officer of Underwater Construction Team Two (UCT-2), Port Hueneme, California, mans an M-60 machine gun, while he keeps an eye out for hostile activity, while the rest of his Seabee Engineering Reconnaissance Team (SERT) element conducts a hydrographic survey of Shoalwater Bay, during Exercise TANDEM THRUST 2001