U.S. Marine Corps photo by Lance Cpl. Daniel A. Wulz/Released 101004-M-0000C-000.jpg
Oct 4, 2010
Ray “The Diceman” Semko gives an operational security brief aboard Marine Corps Base Camp Lejeune, N.C., Oct. 4, 2010. Semko uses the acronym D.I.C.E., meaning defensive information to counter espionage to teach about the importance and practice of operational security.
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