One hundred and ten UK military personnel from across the British Army, Royal Navy and Royal Air Force are deploying as non-emergency drivers to support the Welsh Ambulance Service NHS Trust (WAST).
Starting today, they will be tasked until the end of November with easing pressures caused by coronavirus, following a Military Aid to the Civil Authorities (MACA) request made to the Government.
The Armed Forces ambulance drivers are not expected to drive under 'blue light' conditions, instead being assigned to lower priority calls.
Watch: At the start of the pandemic, service personnel were given training to drive ambulances.
Defence Secretary Ben Wallace said: "I am proud of the tireless work of all our service personnel during this pandemic.
"They continue to provide important support, working alongside our dedicated emergency services across the UK.
"The deployment of 110 personnel to support the ambulance service will ensure WAST can continue to deliver their life-saving services."
Welsh Ambulance Service chief executive Jason Killens said he was grateful for the military's support, praising their "superb job of assisting us on two occasions" in 2020.
Further to the 110 drivers being deployed from the Armed Forces, three personnel are being tasked with providing support planning at NHS Wales.