~Heiter UN 4 6 4994 8-24-65 ITR-1639 Army. N7 (Report: SECRET) Signal Research and Development l. Hardtack. RADAR DETERMINATION OF FIREBALL PHENOMENA. OPERATION HARDTACK --PROJECT 6.5. E. Baker, T. Viars, 2. October 14, 1958. 4. Butternut_Burst-Ball of Fire. Koa Burst--Ball of Fire Wahoo Burst-Ball of Fire Teak Burst--Ball of Fire Authors (4) Corp.. Avithor Lab., Fort Monmouth, N.J. A. K. Harris, andl. A. Balton. 36p., 3. 5. I. II, Project 6.5 [3