President Barack Obama has presented Purple Hearts to two troops wounded in service.

Obama presented the honors while visiting wounded troops at Walter Reed National Military Medical Center in Bethesda, Md. That's where many U.S. troops injured in Iran and Afghanistan are treated.

Obama visited for about an hour with 15 service members from the Army and Marines and one member of NATO forces. He also participated in a promotion ceremony for a military member.

The White House didn't release names or details about the wounded troops.