For the bow flap, the team achieved a weight savings of 25% over the aluminum base line. It is a carbon fiber reinforced/toughened epoxy sandwich that has an integral composite hinge. The bow flap extends forward on the vehicle in water mode and is subject to extremely high wave slap loads. The complex core assembly is designed to distribute load from the actuator pads throughout the structure. The composite chine flaps achieved a 43% weight savings over the highly optimized high speed machined aluminum chines. The composite chines are S2 glass/vinyl ester sandwich structures, and although their primary use is to cover the tracks in water mode, the highest loading they see is the land mode when they are tucked up under the belly of the vehicle. The composite chines have been tested in land mode and with a simulated mine blast.