When the British are a member of a - by far not existing European army - yes.. just like the Portugese, Spanish, Italian, Maltese, Danish etc regiments.
Same when the Argentines want to repeat to get the Malvinas/Falklands again, as the Royal Navy now by far does not have the capacity of then, so French, German, Italian, Dutch etc naval ships have to join.
This medal also has two sides.

If there was to be any EU army mobilisation you can bet your tin EU medal that your listed countries forces would firmly at home somewhere.
If there was any repeat of the Falklands the same counties forces would be in the same place. Same as the last time they didn’t help the UK. The French were even helping the Argies with Exocet missiles!

Changed my avatar to celebrate the windfall Farage wreckers could do to the Tory party. Thanks guys. 

14 hours ago, puipuitom said:

Which expertise the EU member states do not have yet, but will need ? 

Military.

14 hours ago, puipuitom said:

Yes, an English delegation on horseback -as cars they cannot afford anymore - knocking at the EU and begging to be associate member again

Gibberish comment.