The Army will be looking to win their first Inter Services Rugby Championship in three years when they meet the Navy at a sold-out Twickenham stadium.
Saturday's showdown will be the 100th meeting between the teams, with the Army desperate for victory after seeing the Senior Service lift the title last season.
Twelve months ago they let slip a commanding 26-9 point lead before eventually drawing the contest 29-29 - a result that saw the Navy crowned champions.
Skipper Capt Rob Lennox says Saturday is the chance for redemption.
"We were all devastated... you have to pay huge credit to the Navy... but it'll be ours to win back this year."
Meanwhile, the Army women are overwhelming favourites to retain their title if they beat the Navy women at Kneller Hall.
Prince Harry will watch the game at Twickenham as patron of the Invictus Games Foundation - the official charity of the day for this year's 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.