171229-N-NO818-002 YOKOSUKA, Japan (Dec. 29, 2017) Steelworker 2nd Class Erik Grassauer supervises Steelworker Constructionman Jesse McConville, both assigned to Naval Mobile Construction Battalion (NMCB) 4, while he welds bollards to place around the Pre-Engineered Building (PEB). NMCB 4 is the forward deployed pacific NMCB ready to support major combat operations, humanitarian assistance/ disaster relief operations and provide support to Navy, Marine Corps and joint operational forces. (U.S. Navy photo by Steelworker 2nd Class Jeffery S. Boerma/Released)