The Prime Minister David Cameron, Alex Salmond and the Princess Royal are set to join thousands of visitors at the sixth annual Armed Forces Day.
Crowds will enjoy piping, parades and a display by the world-famous Red Arrows as Britain marks the contribution of servicemen and women past and present in Stirling, Scotland.
There will be entertainment in the form of a parachute display and displays by Typhoon and Tornado jets, with Stirling Castle providing the backdrop.
Armed Forces Day was established in 2009 to honour the country's servicemen and women and their families across the Army, Navy and RAF.
Read Labour leader Ed Miliband's blog to mark Armed Forces Day, as he is set to join thousands at the sixth annual event in Scotland.Read the full story ›
A special rail travel discount for the Armed Forces is to be extended to cover all active volunteer reserves, Prime Minister David Cameron will announce today. The HM Forces railcard will also cover reservists' spouses and children.
Available from next week, the railcard will give reservists a third off fares for family days out and trips to visit friends.
The railway has been supporting the country's serving troops with the forces railcard for over 30 years. In Stirling in Scotland to celebrate Armed Forces Day, Mr Cameron said the extension was "fantastic".
He went on: "I know that the forces railcard is already a huge help to tens of thousands of hard-working troops around the country and this is a further recognition of the increasingly vital role our reserves play in our Armed Forces".
General Sir Peter Wall, who will lead the armed forces review into whether to lift the ban on women serving in combat roles, has said the key issue in determining the outcome would be the "delivery of operational effectiveness".
The review into whether to lift the bar on women joining the infantry and the Royal Armoured Corps was brought forward by Defence Secretary Philip Hammond.
The Ministry of Defence had been required to review its existing policy on the deployment of women by 2018 under EU equality laws.
The former head of the Army, Lord Dannatt, has told ITV News he believes female soldiers should not be allowed to serve in front line roles.
Gen Dannatt, who led the Army from 2006 to 2009, said combat situations in which units attack with "violence, bayonets and machine guns" are "not the right place" for women to be.
Defence Secretary Philip Hammond has said the armed forces must review the role female soldiers can play in combat situations to ensure women know the organisation is "fully open" to them.
Mr Hammond said the reality of the armed forces is "very different" from the "macho image" that he said many continue to apply to it.
But he said the restrictions on women in combat situations is "something we have to look at again", in part because of the "message" it sends to women "who might be looking to join other parts of the military".
It is a move that the head of the army, General Sir Peter Wall, has already suggested might make the armed forces "look more normal" - and it seems Defence Secretary Philip Hammond now agrees.
He has ordered a review of whether women should be allowed into combat to start immediately, and wants a report on his desk by the end of the year.
Earlier he told journalists that if the US, Australia and even France had women in combat roles, it was time for Britain to look at the policy again.
Currently, there are more than 16,000 women in the armed forces but about 30 per cent of roles are closed to them.
The Defence Secretary says he does not envisage the numbers who apply will be that large but suggests it is time to send a signal that the army is open "to all who can meet the standards required".
It is also true that if the change does go ahead next year, it will not harm the Government's attempts to appeal to women voters in the run up to the General Election.
The Ministry of Defence has unveiled a human-sized robotic mannequin that will test chemical protective suits for the armed forces.Read the full story ›
Armed Forces Minister Mark Francois said he was "proud" of the work done by soldiers helping a flood-hit community as they reinforce a dam protecting an electricity substation.
Around 20 troops from 7th Battalion The Rifles, known as 7 Rifles, were stacking up sandbags in submerged fields in Reading, Berkshire, where the River Kennet has burst its banks.
Responding to a coroner's call for a review of mental health procedures for soldiers at the inquest of a Pte Lee Bonsall, who was found hanged at his home in 2012, a Ministry of Defence spokesman said:
Every suicide is a tragedy and our thoughts remain with the families of all those who have sadly taken their own lives. Mental health of our personnel and veterans is a top priority for the Government that is why we have committed £7.4 million to ensure there is extensive mental health support in place for everyone who needs it.
Medical experts and clinicians working in our Armed Forces and across the NHS are committed to providing the best possible care to all those that have bravely served their country and to ensuring a smooth transition from the Armed Forces into the NHS.
This includes improving the transfer of medical records on discharge to provide better continuity of care and providing mental health assessments prior to discharge. Letters are also included in the NHS medical notes to their GP stating they have been under military medical care and by keeping their NHS number so they are identifiable and remain visible in NHS systems.