NATO Travel Order
I can quite believe that the NATO travel order helped at US Border and Customs, the first question asked of any US Military personnel at any "official" establishment is: "where are your Orders?", the same officials assume our NATO TOs are the equivalent. Also very good for admittance to cheap accommodation in BOQs, N.Island San Diego for example! Any self respecting "Herc" operator carried a spare, blank copy in his/her wallet, for emergencies!!!