April 27, 2012 (14 images)

President Barack Obama applauds First Lady Michelle Obama as they meet with troops, veterans and military families at the headquarters for the Army's 3rd Infantry Division in Fort Stewart, Georgia on April 27, 2012. UPI/David Tulis

Guitarist Steph Paynes of the rock group Lez Zeppelin plays another Led Zeppelin hit during their performance at the State Theater in Falls Church, Virginia on April 27, 2012. The all-girls band only plays music by the British rock legend group Led Zeppelin and continued their spring tour by playing a benefit concert for Patch Adams. The band members are lead singer Shannon Conley, guitarist Steph Paynes, bass Megan Thomas, and drummer Leesa Harrington-Squyres. UPI/Pat Benic

President Barack Obama and First Lady Michelle walk past M1 Abrams tanks to a show of hands before signing changes to the educational GI Bill at the headquarters for the Army's 3rd Infantry Division in Fort Stewart, Georgia on April 27, 2012. UPI/David Tulis

Expedition 30 Commander Dan Burbank, left, Flight Engineers Anton Shkaplerov, center, and Anatoly Ivanishin sit in chairs outside the Soyuz Capsule just minutes after they landed in a remote area outside the town of Arkalyk, Kazakhstan, on April 27, 2012. NASA Astronaut Burbank, Russian Cosmonauts Shkaplerov and Ivanishin are returning from more than five months onboard the International Space Station where they served as members of the Expedition 29 and 30 crews. UPI/NASA/Carla Cioffi