'Mystery drones' flew over US military base for 17 days in 2023, puzzling Pentagon

A swarm of 'mystery drones' were spotted in restricted airspace over America's Langley Air Force Base in Virginia in December 2023, puzzling officials of The Pentagon (headquarters of the US Department of Defense), The Wall Street Journal reported. The drones reportedly arrived at dusk at Langley, flew off and circled back for 17 days and were "nearly impossible to track".