SRRe eo Oe WT-1619 OPERATION HARDTACK— PROJECT 2.1 reya SHIPBOARD RADIATION FROM UNDERWATER BURSTS (U) M.M. Bigger, Project Officer H.R. Rinnert H. A. Zagorites U.S. Naval Radiological Defense Laboratory San Francisco, California This material contains information affecting the national defense of the United States within the meaning of the espionage laws Title 18, U. S. C., Secs. 793 and 1794, the transmission or revelation of which in any manner to an unauthorized person is prohibited by law. 405°698-§3