The game will be the 100th meeting between the Army and Navy's players.
It was in 1907 when the two Unions came together to play what has now become the world's biggest Friendly.
Up to this weekend 709 Marines, Sailors and Soldiers have represented the Royal Navy and the Army in 99 fixtures.
For those who take to the field for the 100th, it will be an extraordinary honour.
Of course, you might have expected the centenary to have been in 2007 but the 10-year gap represents the breaks caused by the two world wars... and, by consequence, it reflects the men - some of them great players - who never got to grace this fixture.
Two games were played in 1907, the first in February and the second on December 18, both played at Queen's Club and both won by the Royal Navy. One of their most famous players was Lt Fred O'Brien Wilson, the Great Grandfather in Law of recent Army Captain Darrell Ball.
Twickenham first staged the Army Navy match in 1920. And it would be another six years before the Army would win their first Inter Services Championship.
Ahead of the match, a 'scientific research' carried out by Forces News has revealed who is set to win the 100th Army Navy game:
ARMY v NAVY NUGGETS
- To date the Army have won 60, the Royal Navy 35 and there have been four draws, including last year's 29-all draw and in 1980 when it finished 0-0.
- The Army's highest score was 53-16 in 2003, the Navy's 34-17 in 1995.
- The Army have scored 1459 points, the Navy 1043.
- The Navy won the first three games, two of them in 1907, which were all played at Queen’s Club.
- The record try scorer is the Army's Semesa Rokoduguni with 10 to date, including hat tricks in 2012 and 2013.
- The Navy's Dave Pascoe has scored the most individual points, 110 - one try, 14 conversions and 25 penalties (he is on the bench for this game).
- The final score in the 1910 encounter was 19-10 to the Army.
- Between 1907 and 1920 only Army and Navy officers were allowed to play in the game.
- The Army's captain in the first match in 1907, Basil Hill, was a Royal Marine. He went on to captain England.
Former Premiership referee and Navy Head Coach Geraint Ashton Jones has been commissioned by match sponsors Babcock to produce a book commemorating the 100th match.
You can watch live coverage of the Army v Royal Navy clash on Forces TV (Sky channel 264, Virgin 277 and Freesat 165) on Saturday from 14:50 BST, and listen live on BFBS Radio.
Plus there'll be lots of colour and fun from the day itself on Forces.net and Forces News and BFBS Radio's Facebook pages.