Computer hacking experts from the National Security Agency and various branches of the U.S. armed services try to break into remote networks set up by competing U.S. military service academies. The hackers' war room is in a building in Columbia, Md., owned by Parsons, a U.S. defense contractor. David Welna/NPR hide caption
Armed pro-Russian militants attacked a demonstration of supporters of Ukraine in Donetsk on Monday. Olya Morvan/Maxppp/Landov hide caption
Elon Musk, chief executive officer and chief designer of SpaceX. Jewel Samad/AFP/Getty Images hide caption
The second atomic bomb test at Bikini Atoll on July 25, 1946. The Marshall Islands, where Bikini is located, is suing the U.S. for what it calls a violation of the Nuclear Non-Proliferation Treaty. Anonymous/AP hide caption
President Obama speaks at a joint news conference with Japan's Prime Minister Shinzo Abe in Tokyo on Thursday. Obama reinforced the U.S.-Japan security commitment. Junko Kimura-Matsumoto/AP hide caption
Syrian President Bashar Assad (right) visits the Christian village of Maaloula, near Damascus on Sunday. Assad's forces have been gaining the upper hand in the fighting, and the CIA is now increasing training and aid to Syrian rebels. AP hide caption
The soldier formerly known as Bradley Manning was dressed as a woman in this 2010 photograph. U.S. Army handout/Reuters/Landov hide caption
President Obama and Japan's Prime Minister Shinzo Abe depart Sukiyabashi Jiro sushi restaurant in Tokyo, on Wednesday. Obama met with Abe on the first stop of a four-nation visit to Asia. Carolyn Kaster/AP hide caption
Pat Tillman, in a 2003 photo provided by Photography Plus. Tillman was killed in a friendly-fire incident in Afghanistan on April 22, 2004. AP hide caption
An airborne Apache attack helicopter takes off above a Black Hawk helicopter from the South Carolina Army National Guard base in Eastover, S.C., in 2007. The Army is planning to move all the National Guard's Apache helicopters to the regular Army, a move opposed by many in the Guard. Mary Ann Chastain/AP hide caption
Soldiers assigned to the 120th Combined Arms Battalion, 30th Heavy Brigade Combat Team, participate in desert training at the National Training Center at Fort Irwin, Calif., in 2009. Gerry Broome/AP hide caption
What motivated Edward Snowden to leak NSA secrets? Bryan Burrough, Suzanna Andrews and Sarah Ellison explore Snowden's background in an article for Vanity Fair. The Guardian/Getty Images hide caption
Men pray on the street before the start of the American Muslim Day Parade in 2010 in New York. Spencer Platt/Getty Images hide caption