@LHoffman:
Let us use your example of Germany or Italy attacking Turkey. They would have to control the land mass of Turkey in order to navigate the Dardanelles. To do so, The Axis will have to fight off at least 7 infantry, likely some artillery and maybe one or two small ships. That is just to be able to make an invasion in the Black Sea. That burns one turn which will give the USSR plenty of time to move forces in for defense or counter-attack. Regardless of how well the battle for Turkey goes, it would almost certainly be a one time attack. Even in Global, the Axis simply do not have the resources or leeway to make such a move more than once (if that).
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That said, I still don’t see much application for extra Neutral units because historically they had next to nothing to fight a modern war with. Every country has manpower and some semblance of an army, which is why Infantry activation is a simple, accurate and universal medium. Unless I am mistaken, Turkey had one of, if not the, largest armed forces of any Neutral nation in WWII. Even then Turkey had a few subs, a couple destroyers and a cruiser. The post on this forum outlines their naval forces, calling them “insignificant”. Which I would venture to say includes armor and aircraft as well.
I will clarify and modify what I was trying to say. You could make it so that simply passing through the Turkish strait is seen an act of war. You don’t have to control Turkey itself in order to pass, but it IS seen as an act of war on a strict neutral. You could then place a cruiser or sub or something like that in the black sea to signify their small navy. With this method, it would be possible to move into the Black Sea and drop a small army behind enemy lines, taking a Russian territory (or two, or three).
It may be true that Neutral navies were rather insignificant, but I would point out that that forum also mentions that Turkey has 37 Artillery regiments, as opposed to 66 infantry (95 including cavalry). So while maybe tanks, planes, and ships aren’t that great, artillery are still significant, yes?