Coastal Riverine Force (CRF) sailors aboard a 34-foot Patrol Boat, a Riverine Assault Boat (RAB), a Riverine Patrol Boat (RPB) and a Riverine Command Boat (RCB), left to right, prepare for a dynamic display of their capabilities at Joint Expeditionary Base Little Creek-Fort Story Aug. 23. CRF is a core Navy capability that provides port and harbor security, high value asset protection and maritime security operations in the coastal and inland waterways.