It depends on what you mean by letting them "handle" your investments. Unless you have over $250,000, they're likely to set up an account for you that is "self-directed", that is, you will make the investment decisions from among the choices they offer.
Investment accounts where a professional makes all the decisions for you are generally pretty expensive, around 2% annually of the assets being managed, and unless the amount of Assets Under Management is significant, most firms won't do business that way, because it isn't efficient (profitable) for them to do so.
Being eligible for USAA membership, you must have some relation to the military. A good source of unbiased information for you is Save and Invest.
Randy Wall, MBA, CFP®
Penn Cove Financial