Why are bikini models riding around in military vehicles and firing high-powered weapons?

That's what the Utah National Guard and the Utah Department of Public Safety are asking after a risque video emerged that apparently shows camouflage bikini-clad models at a private gun range in Utah.

The investigation is looking into how the models gained unauthorized access to the equipment and also why two public safety personnel appear in the video.

The video was created to promote the 2015 "Hot Shots Calendar," which raises money and awareness for wounded warrior charities in the United Kingdom and the U.S.

The maker of the calendar released a statement, saying, "It's a harmless pinup entertainment that over the years has helped raised awareness and donations for injured veterans charities."

Still no answer to who gave access to the bikini models.

Watch the clip above and check out photos below.

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