Builder 3rd Class Sean C. Hull of Mt. Vernon, WA, uses a magnesium float trowel to flatten a freshly poured mix of concrete during a fencing project for the Mobile Mine Assembly Unit on the island of Guam. Petty Officer Hull and the Seabees attached to Naval Mobile Construction Battalion Four Zero (NMCB 40) are working on various construction projects throughout the island of Guam. U.S. Navy photo by Photographer?s Mate 3rd Class Lamel J. Hinton