170411-N-CJ186-0152 POHANG, Republic of Korea (April 11, 2017) U.S. Coast Guardsmen and Republic of Korea (ROK) Marines conduct sentry duties at the Dogu Beach, ROK, entry control point during Operation Pacific Reach Exercise 2017 (OPRex17). OPRex17 is a bilateral training event designed to ensure readiness and sustain the ROK-U.S. alliance by exercising an area distribution center, an air terminal supply point, combined joint logistics over-the-shore, the use of rail, inland waterways, and the coastal lift operations to validate the operational reach concept. (U.S. Navy Combat Camera photo by Mass Communication Specialist 1st Class Torrey Lee)