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A Japan Maritime Self-Defense Force sailor practices handling a M240B machine gun under the supervision of Coastal Riverine Squadron (CRS) 4, Det. Guam Sailors during a tour aboard a Mark VI patrol boat at Naval Base Guam, March 5, 2018. CRS-4, Det. Guam, assigned to Coastal Riverine Group 1, Det. Guam, is capable of conducting maritime security operations across the full spectrum of naval, joint and combined operations. Further, it provides additional capabilities of port security, embarked security, and theater security cooperation around the U.S. 7th Fleet area of operations.