A Phule and His Money — Robert Asprin

AMUSEMENT PARKS -- THE FINAL FRONTIER
Captain Willard Phule has whipped his troops into shape. That's how he turned Phule's Company from the laughingstock of the Legion into...a crack team of casino security guards.

Now his company is deployed to help an underdeveloped planet. And what better way to utilize their major area of expertise--goofing off--than to turn it into the biggest intergalactic playground ever?