I would also like this feature. If that's not an option for USAA, then I would recommend that you allow the Visa Purchase Alerts system the ability to do it.
I tried to sign up for this and it tells me that:
Your financial institution offers a similar alerts service so this Card is not eligible for Visa Purchase Alerts. Please contact your financial institution to learn more about their service.
I would say that my financial institution doesn't offer something similar and that I would love to enroll in this. Can USAA change their "status" on this so that we can sign up for these? As stated by other members, I have this on other cards and it's very handy but also has stopped fraud instantly because I've had my CC number stolen and I caught the very first purchase. Before I had this another CC was used for a day and racked up almost $1500 in fradulent activity before it was caught. I would think this would save USAA alot of money and probably time too.