This video explains some UFO incidents that were documented by the British Ministry of Defense. This is the DEFENSE DEPARTMENT equivalent to the Pentagon. These detailed files cover specific UFO reports. They cover a period from 1981 - 1996. This is the FOURTH installment, please check these file out at http://ufos.nationalarchives.gov.uk/. There`s also a file that states that a U.S pilot was told to "lock-on" this unknown object, but as he got close the object got away and sped up to thousands of miles per hour.