Under Article 42 the formation of an EU Army would have to be agreed by all 28 members states.
We have a Veto.
As a condition of opting out of ever closer union it has been said we'll have to forgo our veto.
http://www.theguardian.com/politics/2015/jun/02/britain-eu-veto-opt-out-david-cameron
David Cameron has been told by an influential German MEP that Britain will need to forfeit its veto in European Union decision-taking if it wants to be exempted from the EU’s definition as an “ever closer union”.
I also think if we were the only country not to want an EU army we would never use the veto.
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