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Are you eligible to be a member iof USAA? You need to be a Veteran, but not necessarily retired.
Do you have a close relative that is a member?
You arent eligible for membership because of a credit profile, so if you arent eligible, it must have been a mistake.
If you are eligible, I would recommend joining and maybe waiting at least 3 months or more and then making the app when scores and reports are better.
I am a member and very happy with them. I did an app for their CC right after joining with low scores (dont recall the score, it was in 2012, but it was probably in low to mid 500s) and I was denied, but offered a secured CC. I got it for 250 so I could build a relationship with them. It does not graduate, but it did help with building the relationship, along with auto insurance payments. Last month, I did get a regular CC with them and I closed the secured one.
HTH