The Pentagon released raw footage from encounters between US fighter jets and "anomalous aerial vehicles" or as most people call them UFOs. The footage was released after the existence of a secret program was made known by the Pentagon called the Advanced Aviation Threat Identification Program.
The program which ran under the Defense Department was tasked with collecting and analyzing a range of "anomalous aerospace threats." These threats ranged from advanced aircraft produced by foreign governments to commercial drones and ran officially from 2007 to 2012, however officials familiar with the program note that data continued to be collected as recently as last November 2017.
The cockpit videos which the Pentagon released show struggling pilots attempting to lock on to the unidentified aircraft with their radar systems. However after the strange craft rotated and hovered briefly they sprinted away at speeds that shocked the pilots.