ABC News’ Ann Compton reports: First lady Michelle Obama made an unannounced stop at the Walter Reed Army Medical Center this afternoon to visit wounded troops. "The first lady is visiting privately with wounded warriors and their families at Walter Reed Army Medical Center. This is her third visit to Walter Reed and part of her ongoing private meetings and visits with wounded warriors and their families around the country," an administration official said. Mrs. Obama last went to Walter Reed in August. Earlier today, President Obama and the first lady met with families of troops lost in combat and then took part in a wreath-laying ceremony at the Arlington National Cemetery. The president spent his afternoon playing golf in Ft. Belvoir, Va.