apparently you are that dense or that ill-informed. At least in the US, women have always volunteered for the military in numbers greater than there were positions open for women. In fact, women have disguised themselves as men to serve as soldiers for hundreds of years or longer. Now it is true that during war time, some men have disguised themselves as women but that has been to avoid military service. Women have also served as spies and in various espionage roles that out their lives in danger. Women have served in medical positions without having the privilege of being armed. Women in the military also die in combat.
And they never did this...
discriminatory incidence of males in the military--to include compulsory service.
They were never included in a draft, or in bucket duty. That's what makes it an MRA issue. If both men and women have the freedom to not be drafted into military service, then it ceases being an MRA or feminist issue. That doesn't mean military service and action ceases being an area of concern for people, including MRAs. It ceases being a gender discriminatory one so it ceases being what they will talk about at most MRA advocacy places.