Sumiteru Taniguchi, 86, a survivor of the 1945 atomic bombing of Nagasaki, walks up to deliver his speech at the 70th anniversary of the atomic bombing in Nagasaki, southern Japan, on Sunday.
A Minuteman III missile engine is loaded into a truck for transport to another building for X-raying before being torn down and rebuilt. The Air Force's missile command-and-control structure has been the subject of several recent scandals.
Douglas C. Pizac/AP
An Iranian security guard at the Bushehr nuclear power plant in 2010. Iran and negotiators from six world powers are trying to work out a long-term deal on Iran's nuclear program.
First Lt. Patrick Romanofski (center) and 2nd Lt. Andrew Beckner (left) practice the launch of nuclear weapons. Promotions are now more strongly influenced by hands-on performance in this simulator.
R.J. Oriez/U.S. Air Force
Anti-nuclear activists (from left) Gregory Boertje-Obed, Sister Megan Rice and Michael Walli, pictured Feb. 6 in Knoxville, Tenn., were sentenced to prison terms on Tuesday for the 2012 break-in at Y-12 National Security Complex in Oak Ridge.
Linda Davidson/The Washington Post/Getty Images