The X47-B (above is USN photo) is an unmanned carrier launched aircraft. The Navy has deployed it for tests. As they state:
The X-47B Unmanned Combat Air System Demonstrator (UCAS-D) conducted
flight operations aboard the aircraft carrier USS Theodore Roosevelt
(CVN 71), Nov. 10.
The event, the most-recent in a series of carrier-based tests,
demonstrated the integration of the latest in naval aviation technology
with the most advanced and capable carrier.
It is interesting in that Carrier Groups present powerful deployment platforms but are also vulnerable to sophisticated attacks.
As USNI reports they will potentially operate jointly with manned aircraft.
During the two previous X-47B at-sea periods onboard USS George HW Bush
(CVN-77) and USS Theodore Roosevelt (CVN-71) in 2013, while the unmanned
demonstrator had a Boeing F/A-18 chase aircraft, the two types did not
operate together on the carrier flight deck. This time around the manned
F/A-18 and X-47B will operate from the carrier together cooperatively.
This means that the reliance upon fixed deployment platforms may be diminished.