Between now and December 15, 2006, each time you use your Pentagon Federal credit card, you’re automatically entered to win a vacation for two to Puerto Rico, valued at $3,000.

As a reminder, if you’re not already a cardholder, the PenFed Visa Platinum Cash Rewards is a great cash back card, earning a flat 1.25% cash back on all purchases. In addition, it’s useful for overseas travel, as it’s one of the few credit cards that does not add a currency exchange surcharge on top of the 1% that Visa/MC charge.

More details about the Puerto Rico sweepstakes can be found here.