1. Lt. Col., U.S. Air Force, 131 Trenton Pl, Cameron NC 28326, US (Corresponding author), e-mail: joel.sloan@juno.com
2. Professor, Virginia Polytechnic Institute, Blacksburg, VA 24061, US, e-mail: filz@vt.edu
3. The Collin Group, Bethesda, MD 20814, US, e-mail: jim@thecollingroup.com