A friend of mine submitted to the NSA a FOIA request for information relating the activities of an institution and the National Security Agency. Below is a credit card form included in that response. It seems America's largest and most secret intelligence agency sticks with VISA. A good choice given VISA is everywhere you want to be and life doesn't take American Express. Apparently, neither does the NSA cafeteria. I thought it was amusing plus between my headache and work, I cannot muster the will to conjure up a better post.
NSA Credit Card Form