I just set this up for USAA bank.
For OFXv1, USAA is only accepting versions 1.0.2 and 1.5.1; the elements can't have closing tags (i.e. XML-style <TAG>text</TAG> won't parse for OFXv1). They're also accepting OFXv2.0 and 2.0.2, which is a better choice.
ORG="USAA", FID="24591" for the bank.
Username is USAA left zero-padded to 9 digits (not 10; that doesn't work).
Password is 4-digit PIN, as used on the website and phone service.
BANKID="314074269" (their ABA routing #).
This works currently.
I don't have investment accounts with them to check.