This is particularly critical in the land and naval domains, where the British Army and Royal Navy contend with empty inventories and obsolescent capability. Broken down by the land, sea, and air domains, Army Technology investigates the out-of-service dates for key UK Armed Forces platforms and replacement programmes. British Army: selected platformsThe British Army operates the Challenger 2 main battle tank, which is being upgraded to the Challenger 3 standard. Royal Navy: selected platformsThe Queen Elizabeth-class carriers are the centrepiece of the Royal Navy. Such systems will be vulnerable in non-permissive environments like the Strait of Hormuz, where Royal Navy MCMVs were highly regarded by the US Navy.