The program has countless videos of UFO encounters by military personnel, as well as interview about firsthand accounts, physiological studies of those who've come into contact with odd crafts, and possibly even samples of unusual technology.
"Why aren't we spending more time on this issue?" he pondered in his resignation letter to Defense Secretary Jim Mattis.
Elizondo told the Times that he kept working on the project out of his Pentagon office until his resignation, along with officials from the Navy and the Central Intelligence Agency, despite the lack of funding.
The shadowy program ended in 2012, according to the Defense Department, but the New York Times reported that it is still up and running - with officials continuing to study incidents brought to their attention by USA military service members while performing their regular duties at the Pentagon.
Research within the program, which was initially launched at the behest of Harry Reid, the Senate majority leader in 2007, was carried out by private contractor Bigelow Aerospace, a company owned by Reid's close friend and firm believer in extraterrestrial life, billionaire Robert Bigelow.
In 1947, the Air Force investigated more than 12,000 claimed sightings.
"This was so-called black money", Reid admitted to the Times.
The advanced Aerospace Threat Identifications program was started a decade ago at the urging of U.S. Sen. One 2004 DoD video obtained by the Times shows cockpit footage from a Navy F-18 Hornet chasing an object the size of a commercial airliner. Elizondo states that the program is still in operation and that he has a successor.
One of the pilots said that the mysterious rotating aircrafts were "going against the 120mph wind".
Reid, who is now retired, also said that he believed that developing the program was a right thing to do. "I think it's one of the good things I did in my congressional service".
An ex-member of Congress staff told Politico that the goal of the programme may have been to surveil the technological developments of rival foreign countries.
"There was really nothing there that we could justify using taxpayer money", the unnamed official said.
LSU offensive line coach Jeff Grimes leaving for BYU
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Benitez hits latest rut as Newcastle fall into drop-zone
We are a young team and when you are not winning you lose confidence, so we have to keep working this way. "We are a young team". Benitez's side are now without a win in their last nine Premier League matches and are in serious danger of relegation.
Philadelphia Phillies sign Carlos Santana
Nephew Joe Lary says the Northport, Alabama, native died Wednesday night after being hospitalized in Tuscaloosa with pneumonia. Rose, who is now 76, sued over Dowd's assertions on the radio in 2015 that Rose had committed statutory rape decades earlier.
Browns look for first win of season against Ravens
It was a strong all-around performance from Mosley, who made plays in all three phases of the game for the Ravens defense. He was a different quarterback after the Ravens were denied a touchdown inside the one-yard line in the first quarter.
Russell Simmons Accused of Rape by 3 Women
The paper quoted a fourth woman, Christina Moore , who accused Simmons of groping her during a brief encounter in Miami in 2014. He said he would "relentlessly fight against any untruthful character assassination that paints me as a man of violence".
Boise State vs. Oregon, Las Vegas Bowl 2017 live stream
OR live stream , start time , betting odds and TV information for the 2017 Las Vegas Bowl between the Broncos and Ducks. But co-offensive coordinator Mario Cristobal was promoted to head coach and he was the players choice to get the job.