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Mike Russo, a U.S. Park Police Officer, has been working in the Washington D.C. region for one year and seven months. "I'm 23 years old and this is the toughest part of my job," Mike said while on duty at the Jefferson Memorial, March 19, 2011. The United States Park Police is a unit of the Department of the Interior, National Park Service, with jurisdiction in all National Park Service areas and certain other Federal and State lands. Photo by Kathleen Gorby