Tell the young men that they will be made tough and elite and turned into warriors, sharing the life of manly men and wearing uniforms that reflect that edgy and dangerous specialness and they will enlist.
Making it just another federal job where you and your sister or girlfriend are interchangeable and there is no sense of male elitism, where women can now pass all the schools and wear all the badges and berets and you are just a part of the same civilian group you were before except that you can be sent to war and have to depend on those people, then why bother.
Look at post #31