Michael Phelps ending retirement
1 of 1
USA's Michael Phelps competed in a heat of the men's 400-meter individual medley in the 2012 London Olympics.
Photos: Paddling: Na 'Ohana O Na Hui Wa'a, May 24
Photos: Boys Scouts: National Cemetery of the Pacific, May 24
Photos: 17th Annual Roll Call of Honor in Remembrance Ceremony, May 24
More Photo Galleries »