Naval Mobile Construction Battalion FOUR (NMCB-4), known as the "Pioneers," was first commissioned in 1942 during World War II to support Pacific theater operations. The battalion played a vital role in constructing airfields, bases, and infrastructure across the Pacific islands, enabling Allied advances. Since World War II, NMCB-4 has participated in numerous conflicts and humanitarian missions, including Vietnam, the Gulf War, and disaster relief efforts worldwide. Renowned for their "Can Do" spirit, NMCB-4 continues to provide critical construction and engineering support to the U.S. Navy and joint forces globally.
