You need to have insurance through USAA to qualify. BMW will require a copy of your insurance card.
Here is the disclaimer:
1.BMW incentives are only available to persons eligible for membership in USAA‚€™s Property and Casualty Insurance Group. P&C membership is generally available to current and former members of the U.S. Military and their former dependents. BMW requires presentation of a Photo ID, and USAA insurance card with USAA number, or a Confirmation letter provided by USAA. For a Confirmation Letter, members can call USAA at 1-855-787-6272. One incentive per member insurance number per calendar year for new BMW vehicles. See your dealer for additional details.