CANON CITY, Colo. - A unit of 25 military paratroopers landed inside the perimeter of a state prison, but not to quell a riot or attempt some movie-script breakout. They just goofed.

The paratroopers, armed with exercise rifles that shoot rubber bullets, landed in a corn field outside the Fremont Correctional Institute early Thursday, Colorado Department of Corrections spokeswoman Katherine Sanguinetti said.

Guards escorted them off the grounds with no violence, she told the Rocky Mountain News.

Sanguinetti said she did not know which military unit was involved. She said an investigation is under way but it appears guards handled the inadvertent intrusion correctly.

The newspaper said the Army and Air Force denied knowledge of the episode. The Colorado National Guard did not return a call seeking comment.

There is a lot in this story that doesn't make sense. Ft. Carson is the nearest Army base and it is about 45 miles from Canon City. The Air Force would have had to have screwed up massively to miss the jump zone by that much. It seems almost impossible since their planes are equipped with GPS. The only units on jump status at Ft. Carson are two Special Forces (Green Beret) detachments. The Army does not use rubber bullets for training. It uses the MILES system, which uses blanks, lasers and laser detectors.