The So Silent it is The Mute Service? - Part 3

Here is the final clue:
What participating Nato countries with operational submarines, about which we rarely get any news, are missing from this listing (including its Europe submenu)?

And, as promised, here is the point of the riddle:
Classified knowledge is compartmentalized when there is need and time enough to do so. Nowhere has the role of safeguarding national interests been performed with more diligence and finesse than in the silent service.

Still don't understand? A civilian version of what military submarining has been about might help:
Suppose you are a subway passenger who for two to three months at a time travels the underground tube system without lighted station stops and without telephone contacts to the sunlit, comfort above. During this travel, you perform a full-time job in close concert with a highly skilled team. Upon returning home, you must: (1) discover what happened in the topside world since your travel began; and (2) never explain (if you even know)where you had actually been, whom you had met, or what, if anything, your travel had accomplished. Of course, most civilians would never volunteer for such zany travel, while submariners do missions routinely in a demonstrably harsher environment.

Such sacrifices add up over the years. Enough so that when people like Ariel Weinmann or John Anthony Walker betray (or attempt to) their country's classified secrets, or others want to advise the world of national secrets held dear by patriots, we seethe with knowing intolerance.

If you succeed in finding a final answer to the country riddle (which answer will never be posted, confirmed nor unambiguously developed by this blog) please keep it to yourself. Only future events (if and when published) will ever disclose or confirm the accuracy of your answer. That, my friends, it how it feels to be a submariner. I had to omit a lot of interesting details in writing this, but you may still get the flavor.

If you are a submariner, unless you find the answer to the riddle, this exercise was no real eyeopener for you. If you have never been a submariner, however, you have just received a slight taste of what the silent in silent service means to its dedicated volunteers. Compartmentalization of classified knowledge is just as important to safeguarding national security as structural compartmentalization is to watertight integrity. Both are too desirable and expensive in terms of tax dollars and personal sacrifices to be wantonly compromised by arrogant traitors or flippant politicians. - Molten Eagle