Britain's Royal Air Force (RAF) on Friday opened to women for the first time, making it the first branch of the military to open every role to female service personnel.
From Friday onwards, even women can apply to join the RAF Regiment, its ground-fighting force.
"A diverse force is a more operationally effective force. Individuals who are capable of meeting the standards for the regiment will be given the opportunity to serve, regardless of their gender," said UK defence secretary Michael Fallon.
Women have already been allowed to serve in close combat roles in the Royal Armoured Corps, but it will be another year before they can seek to enter the Royal Marines, which has tougher physical demands.
The ban on women fighting in combat roles was lifted in 2016 under the David Cameron led government.
In July, Fallon had announced that the RAF Regiment would be open to them from September this year - ahead of an original 2018 schedule.