NASA Global Hawk 871 rolls out on the runway at NASA’s Wallops Flight Facility after landing following a flight in the 2013 HS3 hurricane formation and intensification mission. Image Credit: NASA WFF.

Washington has sent a “letter of acceptance” for Seoul’s project to buy Global Hawk spy drones following congressional approval for the sale, Seoul officials said Thursday. “The LOA has been delivered ...

In 2001, the U.S. Air Force officially took over the Northrop Grumman Global Hawk unmanned air system (UAS) project, now estimated to cost $12.4 billion for 55 aircraft, and embarked on its ...