If you have been in Cumbria and southern Scotland recently, you can't fail to have noticed a lot of military activity.
Thousands of troops from around the world are taking part in a huge military exercise called Operation Joint Warrior.
Hannah McNulty went to see them in action:
More than 3,000 troops are taking part in "Operation Joint Warrior" in and around Galloway Forest in Dumfriesshire.
A group of British and French paratroopers are also carrying out a parachute drop near to the Braid Fell area.
More than 3,000 troops including British and French paratroopers are taking part in a joint training exercise in the Galloway Forest near Dalbeattie.
It will involve a parachute drop in the Braid Fell area, as well as a substantial amount of fixed wing and helicopter flying.
Routine movement of MOD vehicles can be expected between Galloway Forest and the north of Dalbeattie, and convoys may be present on the A75.
Two MSPs have quit the Scottish National Party over the decision to remain linked to NATO. John Finnie and Jean Urquhart will now sit in the Scottish Parliament as Independents.
Last week at the SNP conference, the party narrowly voted to decide to remain tied to NATO if Scotland becomes an independent country. It's thought the pair have quit as they believe that decision is at odds with the SNPs anti-nuclear stance.
The Scottish National Party have decided to drop their long standing opposition to NATO.
The Nationalists have been opposed to the organisation for more than 30 years because of its pro-nuclear stance.
But the party's conference in Perth heard a resolution saying that an independent Scotland should become a member.