190516-N-QF484-1001 ESTRELLA, Philippines (May 16, 2019) Construction Mechanic 2nd Class Brian Castrellon and Builder 3rd Class Matthew Coward, both assigned to Naval Mobile Construction Battalion (NMCB) 4, build tie beam formwork at Estrella National High School. A tie beam is a horizontal beam connecting two parts of a roof. NMCB 4 is forward-deployed throughout the Indo-Pacific region ready to support major combat operations, humanitarian assistance and disaster relief and to provide general engineering and civil support to U.S. and joint forces. (U.S. Navy photo by Construction Electrician 2nd Class Ji Han/Released)