The UK is offering to continue to contribute troops and military assets to the EU’s operations after Brexit.
A government paper also suggests the UK will maintain what it calls a 'deep security partnership' with the remaining member states.
But what does Brexit mean overall for the UK's military?
Ironically, the EU is an organisation which grew out of the Second World War as a means of ending the internal conflict within Europe.
Security is certainly a key issue where Brexit is concerned; in Prime Minister Theresa May's six-page article 50 letter, the word was mentioned 11 times.
It was clear from that point that May saw Britain's military might as a strategic asset to be manipulated in the upcoming negotiations.
But it has long been argued that the UK’s defence forces should not be used as a bargaining chip.
Back in April, George Robertson, a former NATO chief, attacked those who sought to do so.
And security was a central issue for the remain campaign, who argued that our geographic situation placed us very much at risk from Russia, regardless of our involvement in the EU.
In the same period, Defence Secretary Sir Michael Fallon emphasised the way in which a Brexit deal on organised crime and terrorism was essential in maintaining security in both the EU and the UK.
"If there is no deal on that, we are all weaker…because that is a joint effort to tackle organised crime and terrorism."
Meanwhile, the President of the European Commission was advocating the establishment of a European Army entirely separate from NATO.
Germany is particularly keen on this idea; the German national defence commissioner Hans-Peter Bartels has made calls for the organisation of NATO's EU members to converge their militaries to form a single force.
The fear as far as the UK is concerned is that this could undermine NATO’s military power, as well as putting the defence manufacture of the UK into doubt.
Once Brexit deals have been negotiated, France will become the EU's only remaining full-spectrum military - so it is no wonder that the EU are attempting to come up with a solution to losing their largest defence force.
As things currently stand Britain will remain a member of NATO, retain its seat on the UN Security Council, and maintain its position as Europe's biggest military power.