@JD1942 , Hello. We have a funds transfer system that is available both on usaa.com. The first step to make a transfer would be to add the account. Here are the instructions.
From My USAA:
Hope this is helpful. ~ Suzy
Hi @doc0! Great question! They will not be able to see the balance on your account. As long as the person who has your account added, did not say that they have signature authority on the account, they will not have access to transfer out of your account either. ~ Samantha