WASHINGTON (AP) - The father of a U.S. soldier who was taken prisoner in Afghanistan is thanking the motorcycle riders of Rolling Thunder for raising awareness of missing-in-action troops and prisoners of war.

At the annual Rolling Thunder rally on the National Mall, Bob Bergdahl promised his son: "You will come home. We will not leave you behind."  Army Sgt. Bowe Bergdahl, 26, of Hailey, Idaho, was taken prisoner in Afghanistan nearly three years ago. He is the subject of a proposed prisoner swap in which the Obama administration would allow the transfer of five Taliban prisoners long held at the U.S. military prison at Guantanamo Bay, Cuba.

Hundreds of thousands of bikers, including military veterans and non-veterans, gathered in the nation's capital this weekend for the Rolling Thunder rally.

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