Grumman Corporation and Aluminum Chambered Boats, Inc. requirements and capabilities for the U.S. Riverine/Coastal Warfare program. ACB-designed riverine-class hullform. emerging Riverine/Coastal Warfare program requirement. the U.S. architecture. situational awareness and vastly improved survivability. maneuverable, fast and stable. and control architecture. coastal and inland waterway operations. seeking similar capabilities. part of the U.S.