"Many (most?) countries which have MPA have them operated by their navy, there is a certain inescapable logic to it."
That will be, from memory, not including, Canada, New Zealand, Australia, Norway, Spain, Portugal.
The big exception is of course the US Navy - where unfortunately, a career as a professional MPA operator isn't possible as a "full career" is necessary for promotion and they don't have a Spec aircrew type of scheme. For example one USN Exchange Officer went from Kinloss to a carrier as a deck landing officer - that doesn't exactly strike me as inescapable logic.