Parade participants march down Pennsylvania Avenue during the 2009 presidential inaugural parade in Washington, D.C., Jan. 20, 2009. More than 5,000 men and women in uniform will be providing military ceremonial support to the 2013 presidential inauguration, a tradition dating back to George Washington's 1789 inauguration. (DoD photo by Mass Communication Specialist 2nd David Coleman, U.S. Navy/Released)