The USO office is open 24/7/365, they can meet you there any time. After your TOPU brief you'll know exactly what time your flight is and what time you'll be at the USO, they can come any time between then. Also, if your family is there, you can go to a ticketing agent and get a gate pass for your family so they can go through security and accompany you right to the gate and you can spend extra time with them before you fly out. I think (not positive) the USO office can also get you a gate pass. I highly recommend you do this if there's time.
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