The UK Armed Forces (UKAF) football captain says the Irish Defence Forces (IDF) "will be up for a bit of revenge" when the sides meet in Dublin on Wednesday.
The two sides meet for a fourth time in the newly-named Perpetual Friendship Shield, with the Irish players having won two of the previous meetings.
However, in their most recent meeting in 2018 UKAF ran out 3-0 winners and are feeling confident.
UKAF captain, Lance Corporal Ryan Paddock said the game "means a lot to both teams": "It's supposed to be a friendly, but it's very competitive on the pitch.
"They get to compete in the World Championships and European Championships, so for us to compete with teams who can do that it's a good leveller for us to see where we're at," he said.
"They'll be up for a bit of revenge," he continued.
"It's going to be a good game."
UKAF captain LCpl Ryan Paddock expecting 'revenge' in IDF game
The fixture is being played at Richmond Park, the current home ground of St Patrick's Athletic.
The area where the ground now stands was formerly used as a recreational area by the British Army, who were stationed at the nearby Richmond Barracks.
UKAF and the IDF have met three times before, with the Irish side winning 3-1 at St George's Park in 2015 and 1-0 in Kilkenny, Ireland in 2016.
UKAF won the most recent meeting 3-0 last year in Barry, Wales.