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Depends who will be leader of that army. Most likely Germans.
But anyway, it will not happen. I can now imagine all the riots and some partisan movements against European Union threatening the independence of its members. It is already threatening it, although such army would be much more definite. What would be the oath be like? Currently in Polish oath is a reference to the Polish Constitution, Poland, its souvreignty and borders, etc. Nothing about European Union's interests.
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