A U.S. Air Force plane takes off as a Turkish air force fighter jet taxis at the Incirlik airbase, southern Turkey, in 2013. Reversing an earlier policy, Ankara has agreed to allow the U.S.-led coalition to fly anti-ISIS airstrikes from the base. Vadim Ghirda/AP hide caption

itoggle caption Vadim Ghirda/AP

The Naval Posgraduate School's Timothy Chung stands with the unmanned aerial vehicles his team attempted to swarm in May, 2015. That day they were able to launch 20 into a swarm. After a second attempt in July, they got 30. Krista Almanzan/KAZU hide caption

itoggle caption Krista Almanzan/KAZU