Trucks and light armoured vehicles can be built in or from existing truck factories, most of the big companies have a 4x4 option.
Tanks and tracked ifv, the bigger countries need to build one factory each, and ramp up engine and drive unit production.
Not rocket science. And bin 50% of the green targets, solar on most houses yes, closing coal, oil and gas power stations, no. We should have a diverse supply, so we are not reliant totally on imports, or specific regions etc.
Shouldn’t really need to spell that out.