I take it that you are a military professional then? I mean, EU army doesn't mean reinstitution of involuntary military service. Modern armies don't want conscripts. They need trained and dedicated professionals.
Are you expert on the subject? Dedicated professionals are cool and everything, but artillery shells dont really care about how trained someone is and even a highly trained, highly capable and motivated person can only be in one place at a time. Thus, numbers still mean, unless one only plans to do peacekeeping.
And if you are a military professional, surely you understand that you can't defend your own country on your own in this modern world? You're gonna need Brussels, Portugal and Greece to come to your aid if ever the shit would hit the Fin. Reciprocity is no more than reasonable in my opinion.
We've been doing just fine almost solely alone for the past hundred years. Finland is currently militarily one of the strongest nations in Europe(ignoring navies, wartime strength in men and equipment behind only France, Germany and Greece, about a tie with Italy), and likely relative to population size the second strongest in the world after Israel. With largest and most modern artillery of the continent. And I'm not even an arty guy so no branch pride there. The trained, working age reserve is well over a million men, although the initial intended wartime strength is smaller than that.
But, a country needs to be all of that be if it wishes to live next to the drunken bear.
I am pro NATO myself, but against anything that involves EU and armed forces or defences in the same sentence. Currently support for joining NATO stands at something like 25 % so I believe it is highly unlikely that we will be joining any kind of military alliance any soon, including EU's own, and every and each political party avoids the topic like plague.