The report, detailing UFO sightings by military personnel, is due to be delivered to the Senate in June.
Also included in the report will be newly leaked images of a spherical shaped object which was spotted descending into the water off California by military personnel on the combat ship USS Omaha.
The images from both ships were obtained by documentary maker Jeremy Corbell, who was working on a film about UFOs.
A Pentagon official told The Telegraph: "I can confirm that the referenced photos and videos were taken by Navy personnel.
"The UAPTF has included these incidents in their ongoing examinations."
The official declined to give any further details of the sightings.
She said that was necessary to "maintain operations security" and to "avoid disclosing information that may be useful to potential adversaries."
The task force was set up to "detect, analyse and catalogue UAPs (Unidentified Aerial Phenomena) that could potentially pose a threat to US national security."
It reports to the Office of the Under Secretary of Defence for Intelligence and Security at the Pentagon.
Last month John Ratcliffe, who was Director of National Intelligence under Donald Trump, revealed there had been "a lot more" UFO sightings than had previously been made public,
The US public has also been reporting more sightings over the last year.
According to the US National U.F.O. Reporting Center reported sightings were up by 1,000, to more than 7,200, last year.
The number of UFO sightings reported over New York doubled to about 300 last year.
