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…my own prediction is that even if the margin between unionist and nationalist parties should slip still further in the decades to come (though I doubt that it will have changed much by 2021), the outcome of any referendum vote will remain securely on the pro-Union side, no matter how badly led unionism is in the future.
No raycun, it’s an answer that may require further explanation depending on your knowledge of military matters.
You have first to not only consider current threats, but past and future ones. You have, as I said above, to consider the need to fulfil NATO commitments, and also other international operations (which is why the Irish Army has tanks, APCS and ground-to-air missiles). You also have to consider the diplomatic pressure that can be exerted by the presence of powerful armed forces.
Threats to Greece’s borders that required tanks – Turkey, Yugoslavia, the Warsaw Pact.
Threats to Greece’s borders that require tanks – none, though they have use in showing resolve over the Aegean Islands.
Threats to Greece’s borders that might require tanks in future – Turkey, Russia
Threats to Greece’s sea lanes and airspace that required subs and fighters – Nazi Germany, Italy, Turkey, Yugoslavia, the Warsaw Pact.
Threats to Greece’s sea lanes and airspace that require subs and fighters – Turkey.
Threats to Greece’s sea lanes and airspace that might require subs and fighters in future – Turkey, Russia, and who knows what might arise in the Near and Middle East