President Barack Obama's First Pitch

President Barack Obama throws out the ceremonial first pitch to start the baseball season for the Washington Nationals April 5, 2010, at Nationals Ball Park in Washington, D.C. The Washington Nationals honored military children, inviting nine children whose parents are deployed to step onto the infield with the starting players to see the president throw out the first pitch. (DOD photo/Navy Petty Officer 2nd Class William Selby)

President Barack Obama

ANDREWS AIR FORCE BASE (March 31, 2010) President Barack Obama, with the Navy's F/A-18 Green Hornet, announces today addition measures to boost domestic energy production for the Nation to include strategic efforts by Department of Defense to enhance energy security. The Green Hornet is part of the Navy's biofuel fuel program to develop alternative fuel sources to reach the Secretary of the Navy's energy reform targets. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kevin S. O'Brien/Released)

President Barack Obama

This US Marine photo is public domain.

Apollo 11 Crew Meets With President Obama

President Barack Obama chats with Apollo 11 astronauts, from left, Buzz Aldrin, Michael Collins and Neil Armstrong, Monday, July 20, 2009, in the Oval Office of the White House in Washington, on the 40th anniversary of the Apollo 11 lunar landing.

This photo is public domain.

President Barack Obama

U.S. President Barack Obama addresses the U.S. Naval Academy Class of 2009 at Navy-Marine Corps Memorial Stadium in Annapolis during the graduation and commissioning ceremony.

This photo is public domain.