Had a Government CC for a short while when I was in. I was scared to use it for anything! Got rid of it as soon as I could.
The Navy requires you to have a goverment CC for travel, and to use it for everything if you want to be reimbursed.
Used to be you pay for things, keep receipts, and submit them when you’re done with TDY. Not now.
I think there was probably some sweet contracting done with the banks somewhere.