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Adm. Mike Mullen, chairman of the Joint Chiefs of Staff tests a robotic wheelchair prototype at the Excellence for Wheelchair and Related Technology in Pittsburgh on April 19, 2010. Mullen and his wife Deborah have embarked on a “Conversation with the Country” tour, the first leg in a year long series of stops at America’s universities discussing issues that are important to the military and how educational institutions can participate in helping veterans and their families. (DoD photo by Mass Communication Specialist Chad J. McNeeley/Released)