OPERATION HARDTACK— PROJECT 2.7 NUCLEAR RADIATION FROM A DETONATION AT VERY -HIGH ALTITUDE P. A. Caldwell, Project Officer H. D. Holmgren P. Alers R. J. Drachman T. D. Hanscome C. A. Pearse J. R. Pennick R. C. Waddel U. S. Naval Research Laboratory Washington, D. C. blatel-G (newer Ernest A. Pinson, Coil, USAF Techrical Director FA Liban K. D. Coleman, Col, USAF Commander, Task Unit 7.1.3 620 @ Chana” Cioen A. Chiment, Maj, USA Director, Program 2 3