Members of all three armed forces will be allowed to don uniforms for this year's Gay Pride march in London.
The Ministry of Defence announced that the Army had this year joined the Royal Navy and RAF in allowing personnel to take part. Last year, soldiers were banned from wearing anything identifying their military links.
But a meeting between army officials, Pride organisers and the Equality and Human Rights Commission, resulted in an agreement to scrap the ban in time for this year's parade on July 5.
An MoD spokesman said: "Personnel from all three services can attend this year's Gay Pride march in uniform.
"The Armed Forces are committed to establishing a culture and climate where every individual's contribution is respected and valued regardless of sexual orientation, race, ethnic origin, religion, gender or social background."
More than 500,000 people are expected to take part in the celebrations, culminating in a colourful parade through London's West End.
However, servicemen and women will be expected to steer clear of high-jinks of other marchers, expected to wave banners and blow whistles or horns.
"When personnel are wearing service uniform, behaviour of the highest order will be expected of them at all times, in keeping with the traditions of Her Majesty's armed forces," the spokesman added.
Equality and Human Rights Commission chairman Trevor Phillips said he was delighted with the decision. "It will be a historic moment, and a true sign of how much has changed," he said.
Ben Summerskill, chief executive of gay rights campaign group Stonewall, also praised the decision. "We know that this gesture will also be enormously appreciated by those lesbian and gay personnel currently serving in Iraq and Afghanistan."
