<http://schema.org/description>
"Two Global Hawk unmanned aircraft have flown in close formation at distances as close as 30 feet (9 m) for the first time as part of a DARPA program to give autonomous aircraft aerial refueling capabilities."^^<http://www.w3.org/2001/XMLSchema#string>
<http://newatlas.com/global-hawk-uav-formation/24475/>