EMSI Support to TOPOFF4 Exercise

The U.S. Department of Homeland Security conducted the largest and most comprehensive counterterrorism exercise to date from Oct. 15-19, 2007, in Arizona and Oregon, and the U.S. territory of Guam. Top Officials 4 (TOPOFF 4) was the fourth in a series of congressionally-mandated exercises and involves various federal agencies as well as the governments of Australia, Canada and the United Kingdom.