TINIAN, Commonwealth of Northern Mariana Islands (March 24, 2021) Builder Constructionman Alexander Brienen, assigned to Naval Mobile Construction Battalion (NMCB) 4, utilizes a concrete vibe to prevent concrete from clumping together during the placement of proposed bollards at Tinian Harbor. NMCB-4 is forward deployed throughout the Indo-Pacific region and United States, ready to support major combat operations, theater security, humanitarian assistance and disaster relief operations. Seabees provide general engineering and civil support to Navy, Marine Corps and joint operational forces globally. (U.S. Navy photo by Construction Mechanic 2nd Class Wenhan Fan)