170221-N-KT595-001 THAILAND (Feb. 21, 2017) Sailors and Marines chock and chain a UH-60 Blackhawk helicopter after landing aboard the amphibious transport dock ship USS Green Bay (LPD 20) during Exercise Cobra Gold 2017. The exercise is the largest theater security cooperation exercise in the Indo-Asia-Pacific region and is an integral part of the U.S. commitment to strengthen engagement in the region. (U.S. Navy photo by Mass Communication Specialist 2nd Class Chad M. Butler/Released)