The Navy's X-47B combat UAV demonstrator successfully paired with an an Omega Air KC-707 airtanker earlier this week. This marks the first time in aviation history for a UAV to demonstrate aerial refueling capabilities. Unfortunately, these tests also likely mark the end of the X-47B program. Despite only completing 20 percent of its potential flight hours, both of the Navy's X-47Bs are destined for museums. Still, the technologies that they've demonstrated -- including those historic autonomous carrier landings in 2013 -- will make their way into future unmanned combat aerial vehicles as part of the Navy's Unmanned Carrier-Launched Airborne Surveillance and Strike (UCLASS) program.