Our Armed Forces do a magnificent job. It’s my privilege to see the incredible work they do all around the globe, every hour of every day. In Iraq, I’ve spoken to our impressive airmen and women who have been hammering barbaric Daesh [Islamic State] fighters to destroy the death cult that has brought bloodshed to the streets of Britain.

In Poland, I’ve met inspirational soldiers – not simply supporting and leading Nato missions in Eastern Europe but underpinning our security at home.

And in the North Atlantic and the Gulf I’ve listened to the sailors protecting our precious undersea communications cables and patrolling our vital trading routes.

All the while, our dedicated submariners maintain our nuclear deterrent, our nation’s ultimate armour against the most extreme threats to our way of life.

The Ministry of Defence is spending about £20 million a year on mental health services to treat the trauma life on the front line can bring, says Gavin Williamson (right)

These people are the greatest of their generation. And they have the right to expect more than simply the best jets, warships and tanks to help them do their duty.

It is also their right to expect the best possible support on and off the battlefield. In the not too distant past, that would have meant treating the physical scars of conflict. There wouldn’t have been much thought about helping heal the invisible wounds war leaves behind. But times have changed.

We now understand the importance of a healthy mind as well as a healthy body. That’s why the Ministry of Defence is spending about £20 million a year on mental health services to treat the trauma life on the front line can bring. But while things have vastly improved, they are not perfect. We should never be too afraid or too timid to tackle the stigma of mental illness and look at new ways to offer help.

That’s why I want to commend The Mail on Sunday’s Helpline for Heroes campaign for shining the spotlight on this critically important issue. It’s simply unacceptable that serving personnel with post-traumatic stress disorder, anxiety, depression, suicidal or negative thoughts, should suffer in silence.

So I have agreed to spend an extra £20 million over the next decade to improve mental health services in the Armed Forces – £2 million more every year for vital services. Today we launch the Military Mental Health Helpline while bolstering the care currently on offer.

We are forming a deeper partnership with Combat Stress, the leading charity in the UK for supporting veterans with mental health problems. The charity already helps a small number of troops through their 24-hour helpline, but we will be enhancing this service with additional funds and creating the entirely new Military Mental Health Helpline with its own memorable number – 0800 323 4444.

This will be specifically targeted at serving personnel and their families – allowing them to access help anywhere, any time. It will be staffed by professionals and will benefit from improved information-sharing with the military, so those in need get the vital help they need.

Gavin Williamson says he will personally be working with the service chiefs to make sure there isn’t a single person in the Forces who doesn’t know where to turn in times of trouble

We have examined the choices closely and believe this service will deliver the best clinical results for our Armed Forces. The freephone number will take calls 24/7 from midday today. And it will be backed up by a major internal marketing campaign.

The truth is we’ve not always been the best at talking about these issues in the military. So I will personally be working with the service chiefs to make sure there isn’t a single person in the Forces who doesn’t know where to turn in times of trouble.

But I don’t just want people to know who to call when they need to talk to someone. I want them to know what else is on offer. I want them to know about the 20 sites providing mental health care for the military in the UK and abroad, bringing together psychiatrists, mental health nurses, clinical psychologists and social workers to help manage the mental health needs of those in difficulty.

I want them to know more about the Veterans’ Gateway, which offers current and former personnel support on everything from financial assistance to property problems.

I want them to know about our groundbreaking partnership with Prince Harry and the Royal Foundation, raising awareness about the importance of good mental fitness, drawing on the best research and putting a wealth of information online.

And I want them to know we have a mental health strategy that can work for them. It’s about educating our chain of command and working with our people and their families.

It’s about spotting the early warning signs of mental illness. It’s about encouraging those who need help to get it quickly.

And it’s about prevention – building that vital awareness of good mental health fitness into training so that our troops are better equipped to deal with operational stress before, during and after combat as well as the stresses of day-to-day living that we all experience.

As the dangers our nation faces become ever more intense and ever more complex, whether from aggressive states such as Russia, from terrorism or from cyber warfare, it’s vital for us to keep our brave men and women at the top of their game both physically and mentally.

But there’s always more we can do to help those who find themselves isolated or feeling low. So make no mistake, it is one of my top priorities as Defence Secretary to make sure everyone in the Armed Forces feels valued.

Our service personnel remain Britain’s finest. And if the ever-evolving nature of conflict demands that we keep adapting our approach then – have no doubt – we are ready and willing to do so.

No one in our Armed Forces need suffer in silence. Our heroic men and women are the backbone of our nation. They lay their lives on the line for us every single day.

They are the very best of British. And they deserve nothing less than the very best support.

'I'm stunned... an amazing breakthrough': Former RAF sniper whose mental breakdown inspired peer to act praises new helpline

Following the tragic suicide of Warrant Officer Nathan Hunt last month, former head of the British Army Lord Dannatt aligned himself with The Mail on Sunday and fought with this newspaper to see his aspiration for a dedicated 24/7 helpline for serving personnel finally realised.

Last night, an elated Lord Dannatt said: ‘Sadly, there was no one to save W.O. Nathan Hunt when he died by his own hand. But now the helpline is here. The number 0800 323 4444 will connect callers straight away to MoD health professionals who will have immediate access to their medical records. This is a massive improvement. We all owe so much to those who serve to protect our peace and freedom.’

Former RAF sniper Luke Huskisson (left) whose mental breakdown inspired Lord Dannatt (right) to call for the helpline said it was an 'amazing breakthrough'

Last night, Tory MP and former Army Officer Johnny Mercer said: ‘Well done The Mail on Sunday. At a time when journalism is under fire, this is a reminder of what newspapers can achieve.’ And ex-RAF sniper Luke Huskisson, whose mental breakdown inspired Lord Dannatt to call for the helpline, said: ‘I’m shocked, really stunned. I didn’t think we’d ever get this. This is an amazing breakthrough.’

Former British Army medic Chantelle Taylor added: ‘I had no hesitation backing this campaign. The helpline for serving troops is one of those simple measures that could save lives. This is a really good result.’