As the US Air Force manned fighter jet shrinks (and is expected to continue shrinking for the foreseeable future), more and more assets are unmanned aerial vehicles (aka drones). While Northrop Grumman is famous for producing the B-2 Spirit and B-21 Raider stealthy strategic bombers, it is also one of the top advanced drone contractors for the US military. Here are five of the advanced military drones Northrop Grumman has or is building for the US military.