The British Army has signed a £3.5 billion deal ahead of the NATO Summit on Thursday for nearly 600 armoured vehicles, which is expected to create 1,300 jobs across the UK.
The Ministry of Defence will sign the order for 589 Scout Specialist Vehicles at General Dynamics in Caerphilly County
Prime Minister David Cameron said he is "delighted" to announce the biggest single contract for armoured vehicles for the army since the 1980s on the eve of the Summit.
"These new vehicles are testament to the world-class engineering skills in south Wales and across the UK, helping to create the Army's first fully-digitalised armoured vehicles," Cameron said.
At the two-day summit in Newport, due to start on Thursday, the UK will call for increased defence spending by some of NATO's 28 member states.
The first deliveries of the vehicles are expected in 2017, with a training establishment due to be equipped by 2019 and the first brigade set to be deployed in 2020.