This may sound like a stupid question but I've tried googling this to no end. Some sites say yes, some say no. And all the AF sites say yes. (and yes, I know I am in the Army, not the Air Force)Question: Are you authorized to use your government travel card when you PCS? Isn't a PCS technically "official government travel"?

No, you cannot use your government travel card for a PCS ... you can get advance travel (80%), advance DLA and advance pay.

I'll do some research and provide the regulatory guidance tomorrow.

The reason your GTC cannot be used to PCS with is that the funding for the card is paid out of your units funds. When you clear your post your card is "turned off". When you inprocess your new unit one of the things you will have to do is get your card reactivated by your gaining unit.