An RQ-4 Global Hawk unmanned aerial vehicle conducts tests over the Naval Air Station in Patuxent River, Md. (NORTHROP GRUMMAN VIA ASSOCIATED PRESS)

Photo by: Erik Hildebrandt

An RQ-4 Global Hawk unmanned aerial vehicle conducts tests over the Naval Air Station in Patuxent River, Md. (NORTHROP GRUMMAN VIA ASSOCIATED PRESS)