Dallas Cowboys -- Cops Charge $25,000 for Training Camp

Training camp ain't cheap -- TMZ has learned, it cost the Dallas Cowboys roughly $25,000 just to hire a police detail for the 3-week program.

Oxnard Police Department Commander Andrew Salinas tells TMZ, the tab covers a wide range of services involving police and public safety -- staffing 6-8 officers on site per day on weekdays ... and 12 on the weekends.

Salinas says the training camp crowd ranges from 3,000-12,000 fans every day -- reaching capacity on weekends ... which is why they needed the additional officers on Saturdays and Sundays.

We're told the charges also include the use of vehicles as well as a mobile command center (an awesome big RV with computers and radio systems and stuff) ... a player favorite.

Training camp wrapped up Thursday -- and we're told the 80-man roster celebrated their last day with a relaxing trip to the beach at Mandalay Bay Beach Resort (accompanied by police).

When they arrived, we're told the players were immediately met by an overeager group of fans hoping for autographs -- so Tony Romo took one for the team ... and offered to sign their stuff in exchange for a little privacy.