Seventeen hospitals in England have declared critical incidents.
Military medics have been deployed to help NHS doctors and nurses with direct patient care.
General military personnel will also help to support the NHS with non-clinical such as logistics, portering and assisting with patient transport.
The news comes following 17 hospital trusts in England declaring critical incidents over a “perfect storm” of increased patient demand and staffing shortages.
Last week it was revealed that NHS plans for essential bedside care’ to be provided by volunteers, students and therapists if nurse staffing levels do not improve.
Defence Secretary Ben Wallace said: “The men and women of our Armed Forces are once again stepping up to support their dedicated colleagues in the NHS as they work hand-in-hand to protect the nation from COVID-19.
“They have shown their worth time and again throughout this pandemic, whether driving ambulances, administering vaccines or supporting patients in hospital, and they should be proud of their contribution to this truly national effort.”
Ministers can no longer deny the staffing crisis.
The deployment of military staff will be a welcome sight for many NHS workers currently struggling to keep up with the demand for services.
It comes after senior nursing leaders questioned how the new ‘Nightingale hubs’ would be staffed.
The Royal College of Nursing has said the deployment means the government can no longer deny there is a “staffing crisis” within the NHS.
Royal College of Nursing’s Director for England, Patricia Marquis said: “The Government can no longer deny the staffing crisis in the NHS.
“The Prime Minister and others can no longer be dismissive of questions about the ability of NHS staff to deliver safe care.
“Once the military has been brought in, where does the Government turn next in a bid to ‘ride out’ the wave rather than deal with it?
“Nursing staff might welcome any extra help at work right now, but we need to know that the Government isn’t compromising patient and professional standards in any way.”