An artist's rendering shows Northrop Grumman Corp.'s concept for the MQ-Next aircraft. The U.S. Air Force wants such an aircraft by 2030. Rendering courtesy of Northrop Grumman Corp.

An artist's rendering shows Northrop Grumman Corp.'s concept for the MQ-Next aircraft. The U.S. Air Force wants such an aircraft by 2030. Rendering courtesy of Northrop Grumman Corp.

Northrop Grumman Corp...