1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
2. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
3. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. Department of Materials Science and Engineering, University of California, San Diego, La Jolla, California 92093, United States
5. Institute for Soldier Nanotechnologies, Cambridge, Massachusetts 02139, United States
6. U.S. Army Research Laboratory, RDRL-VTM, Aberdeen Proving Ground, Maryland 21005, United States