VERY RARE: U.S. RQ-170 Stealth Drone Spotted Returning to Puerto Rico! Rare footage circulating online shows a U.S. Air Force RQ-170 Sentinel stealth drone returning to Puerto Rico after reportedly supporting U.S. military strikes on Venezuela the previous night. The appearance of the highly classified unmanned aircraft has drawn significant attention, given how rarely the platform is seen in public. The RQ-170 Sentinel is a stealth, high-altitude unmanned aerial vehicle developed by Lockheed Ma