The British Armed Forces cricketers are facing off against each other in the Inter-Services Festival at Vine Lane Uxbridge.
It was a tough first day for the Royal Navy who were well beaten by the RAF.
The Navy were set a target of 229 to win by the Air Force.
The RAF had been pegged back to 108-5 after 20 overs, but thanks to an excellent half-century from Andy McGeorge recovered.
The Navy lost opener Sam Radford in the first over bowled by John Innif, but Jordan Evans and Leo Buscombe put on 68 for the second wicket, giving little away to Innif and the other opening bowler Jimmy Iago.
Things changed though with Evans's wicket, falling just four short of his half-century.
94-3 from 25 overs became 11-7 with Kieran Pearce and John Taylor causing the damage with the ball.
The Navy never recovered from that, and despite stubborn resistance from John Parker wickets continued to fall with the Navy falling short by 85 runs as they ended their innings on 143, with 9 overs left.
After a late start on the second day due to poor weather, the Navy team have been put into bat by the Army in a match reduced to 42 overs a side on the second day of the festival.
The Navy got off to a shaky start but a score of 30 from John Parker helped the Navy to a score of 151- 9.
The Army started strongly despite losing openers, Liam Fletcher and Connor Reid.
A sparkling partnership between captain J Boynton and Tade Carmichael, saw the Army reach the century mark.
Boynton was called out for LBW on 41, whilst Carmichael unbeaten on 68 and Graham Wiseman on 25, took the Army through on a score of 153-3 with nine overs to spare.
Army captain, Corporal Boynton, said: "We've had a three week break so it was good to get out on the field again and the bowlers did really good up top, and we restricted them to a good total and we're always confident to chase that down."
The Army will now take on the RAF on Thursday to decide the winner of the 2018 Inter Services Cricket Championship.