I called HR office couldn't help me. CPO said that they only do the fingerprints for newly hired, but closed due to the shutdown, The Security office in Ramstein told me to go to the consulate in Frankfurt and they are doing it for a few. I tried Legal Office but couldn't get anyone on the phone. Then I thought, let me try ROB again, maybe they are scheduling for after the shutdown. I couldn't believe that somebody answered the phone, the really kind civilian told me that he got called in to do fingerprints and they have been taking appointments. It was his last day and he said he would do my fingerprints, so I drove there and got them done finally!!! So relieved... I can send the completed N400 application next week.
Honestly, I have made much better experience with the Army than the AF. They are much more informed, and super helpful when it comes to immigration questions!