In response to questions from The New York Times, officials at the Pentagon officials acknowledged the program's existence. The program also looked into videos of encounters with unknown objects and USA military aircrafts.
Defense officials told the Times that the program, which investigated reports of UFOs, ended in 2012.
"It was determined that there were other, higher priority issues that merited funding, and it was in the best interest of the DoD to make a change", Pentagon spokesperson Thomas Crosson told the Times.
The program reportedly produced documents that described sightings unidentified aircrafts and was run by Luis Elizondo, a military intelligence official. One of the videos showed an oval object about the size of commercial airplane, according to the Times.
Another episode included a Navy F/A-18 Super Hornet following some sort of flying machine that radiated a "sparkling atmosphere going at rapid and pivoting as it moves".
The Pentagon has sound and video of two exceptionally befuddled pilots gazing intently at a unidentified flying article that pivoted and kept up a "shining atmosphere", as a major aspect of a mystery program that explored the presence of UFOs for a long time at the command of a previous major Democratic pioneer.
What is unusual is when members of the military publicly come forward, such as a group of former Air Force officers who in 2010 asserted their belief that UFOs visited the bases they were stationed at and caused nuclear-weapons systems to temporarily malfunction. Stevens and Inouye have both passed away.
During the meeting, Mr. Reid said, Mr. Stevens recounted being tailed by a odd aircraft with no known origin, which he said had followed his plane for miles.
"If you've talked to Harry Reid for 60 seconds then it's the least surprising thing ever that he loves UFOs and got an earmark to study them", former Reid spokeswoman Kristen Orthman said in a message on Twitter.