Calhoun: The NPS Institutional Archive DSpace Repository Faculty and Researchers Faculty and Researchers' Publications 2021-11-07 Assessing the Effectiveness of the Department of Homeland Security, 20 Years After 9/11 Dahl, Erik J. Watson Institute for International and Public Affairs Erik J. Dahl (2021) Assessing the Effectiveness of the Department of Homeland Security, 20 Years After 9/11, Costs of War, November 7, 2021 (https://watson.brown.edu/costsofwar/pape http://hdl.handle.net/10945/68405 This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States Downloaded from NPS Archive: Calhoun