Petty Officer 3rd Class (SCW) Christopher Acevedo issues an M16 with an M203 grenade launcher to a Seabee from Naval Mobile Construction Battalion (NMCB) 3 The Seabees of NMCB 3 were at Camp Roberts this week in order to get hands on training with large weapon systems. This training theaches the Seabees how to defend their camp in a combat environment if in the event a Seabee battalion is attacked. NMCB 3 is an expeditionary element of U.S. Naval forces Providing construction, engineering and security services in support of national strategy, naval power projection, humanitarian assistance and contingency operations.