SOUTH LAWN CELEBRATION First Lady Michelle Obama describes the accomplishments of the first year of "Joining Forces," a campaign to support military families, at its anniversary event at the White House, April 11, 2012. Army Gen. Martin E. Dempsey, chairman of the Vice Chiefs of Staff; Dr. Jill Biden, wife of Vice President Joe Biden; Tom Brokaw, television correspondent and author; and Air Force Cadet Moranda Hern joined Mrs. Obama. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 785250-Y-WTF92-880.jpg Photo Gallery