As long as there is a parallel military structure such as NATO, or the presence of large numbers of foreign troops (mainly US troops) remains, I don't think the military implications will be much of anything. NATO already shares military technology with each other and practices war gaming on a regular basis. Assuming the EU economies eventually grow and become more efficient, then it's conceivable that European militaries might become larger or more technically advanced, but that's just a guess.
Whose military affairs are you refering to? As #2 indicates, there is no joint armed force as yet as part of the European Union. Whilst the increased integration might make military involvement of member states more unlikely in case of possible repercussions, it seems as if the EU does not have much bearing on military matters at this stage of its life. You might want to further clarify your question to help us give you more accurate comments.
In general, there are not many military implications related to the existence of the European Union. The EU has no military as such and cannot really carry out a single foreign policy, let alone a single military policy.
One reason why there is no EU military is that many of the members of the EU (particularly before its recent expansion) have been members of NATO. Instead of having a united European military, they relied on the collective security that was to be provided by NATO.
Because the EU has no armed forces under a single EU command, it has very little in the way of relevance to military affairs.
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