Unknown number to me. Any idea?

I received 3 phone calls from that number today, twice at 18:16 (both missed) and when I picked at 19:43 (Mountain Time), nobody answered, and the call ended in about 2 seconds.

Just found out that it's a general number belonging to USAA

Thanks-
They just called my cell and I didn't answer.  They didn't leave a message either.