Some years ago, as a Detcom, I had to take a small party of airmen and SNCOs from Brize to a secret Lincs base. We were carrying classified equipment and docs and were ordered to use first class travel. This included a taxi between stations in London.
I didn't have any difficulty with the arrangement, and neither did the lads in the party.
There was no difficulty with Accts when we put in our claims.
Do you think this was wrong?