When I was a student I had a mate who was an inspector in the Met who was doing a 3 year university degree on full pay (he even got a plain clothes allowance). On our trips to London it used to irk me that he could flash his police free travel pass while I had to shell out from my meagre grant (remember them?) for my tube ticket. Can't see Joe Public being terribly impressed seeing relatively well-paid servicemen, eg majors or equivalent on c£50+k, getting free travel while they are struggling to pay for their tube fare.