So for those on AD, you are eligible to get the AMEX Platinum yearly fee waived. Once you have said AMEX Platinum, they will reimburse the fees for the Global Entry. Thus, even if you aren't traveling on orders and feel awkward putting your DODID number in for TSA Pre-Check, you are covered. Authorized users (think spouses) of the AMEX Platinum can also get the Global Entry fee reimbursed thus allowing you to BOTH breeze through Pre-Check at airports.
While you are at it, use your AMEX Platinum to sing up for Boingo wireless. It is free and you get free internet at airports. Yay WiFi! (this message brought to you by Boingo wireless at PVD). At other, larger airports, the lounge access is spotty. Priority Pass is great, but doesn't work the way it used to. Still, when there is a lounge it is wonderful to get away from the hoi poloi of people traveling who don't seem to understand how to do so efficiently. Oh, and get the Emerald Executive level membership with National/Enterprise Rental Cars. Do you know how amazing it is to completely skip the counter and pick any car you want? Amazing. Then you go and stay at a Starwood or Hilton hotel where your AMEX platinum has upgraded your membership to Gold level and enjoy the perks there. Yup, I am a HUGE fan of this card.
**Yes, I am a travel snob. I have done enough travel for my civilian jobs that nothing frustrates me more than people who don't plan ahead for air travel.