Description: Radiation shielding is an enabling technology required for extended manned missions to the Moon, Mars and the planets beyond. Multifunctional structural must protect crew in a spacecraft, crew exploration vehicle, landers, rover, or habitat from Galactic Cosmic Rays (GCR), Solar Energy Particles (SEP) and micrometeroid impact and at the same time keep both the weight of the structure and the cost of fabricating the structure to a minimum. Materials Modification, Inc. (MMI) proposes to develop and evaluate a series of versatile, novel, multifunctional hybrid structural composites comprised of a high hydrogen epoxy matrix