[IEEE IEEE 1998 National Aerospace and Electronics Conference NAECON 1998. Celebrating 50 Years - Dayton, OH, USA (13-17 July 1998)] Proceedings of the IEEE 1998 National Aerospace and Electronics Conference. NAECON 1998. Celebrating 50 Years (Cat. No.98CH36185) - Evaluating thermal and image intensification night vision devices for the ground environment: human factors and usability issues