1. Science Applications International Corporation, P.O. Box 68, Gunpowder Branch, Aberdeen Proving Ground, Maryland 21010-5424 (E.D.E., A.T.); Science and Technology Corporation, 500 Edgewood Road, Suite 205, Edgewood, Maryland 21040 (N.G.); U.S. Army Edgewood Chemical Biological Center, RDCB-DRD-L, 1583 Blackhawk Road, Aberdeen Proving Ground, Maryland 21010 (R.P.M., J.A.G., S.D.C., A.W.F.); and U.S. Army Research Laboratory, RDRL-SEE-E, 2800 Powder Mill Rd., Adelphi, Maryland 20783 (M.E.F., E.L.H., P.M.P.)