1st City Troop rides in inaugural parade
                Members of the 1st City Troop, Philadelphia, ride in the inaugural parade Jan. 20, 2017, in Washington, D.C. This volunteer cavalry troop was the first organized in defense of the colonies in 1774. It is considered the oldest mounted military unit that has been in continuous service to the country since the American Revolution. (U.S. Air National Guard photo by 2nd Lt. Susan Penning/Released)
                
                    
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