aren't many 20-30 something JO operators that are overly bothered by the nuances of admin paperwork as long as the money goes into their account
That probably applies to about 90%+ of the readers of these pages regardless of age. I too work in a joint environment and have both blue and green within the unit admin office. The bottom line is that a claim that is entered into JPA and not called for immediate audit is not a sardine that has passed through a net into the abyss never to be seen again. Stations, squadrons, sections are responsable for the management of costs; visibly more so then ever before, as accountants search every nook and cranny to find savings. That this case is between you and the tax man is irrelevent, the MMA still came out of someones budget in the first place. If Unit Admin are not providing the info then next stop would be the unit Budget Holder (in my case, the unit 2ic) to get the info on your behalf. For certain; do not give up because you are being disadvantaged because of a jobsworth bluntie who is being obstructive.
If all else fails; contact JPA support direct or put in a data protection request which for service details is free of cost. If every serviceman claimed the tax back for MMA then perhaps the rate given would rise to 45p per mile at source and thus save a lot of admin nausea. (Or perhaps MT would aquire enough vehicles for MMA to become a thing of the past!!) The system is taking advantage of a Servicemans 'Can-do' attitude to completing a given task.