[ Military ] Open Question : being a woman in the army?

I'd really like to enjoy the Australian army reserves sometime in the next few years. My brother is in the reserves at the moment as a Rifleman and my family is pretty supportive of him.......because well......hes a guy. I want to be involved in either the medical area or communications but the minute i brought up the idea with my mum and grandparents, they immediately said that the army is a mans job and not a place for women to be. in addition, i come from a traditional chinese family who believe in different gender roles and they would be too embarassed to tell their friends their daughter is in the army because its just not meant to be like that. however they are more than proud to tell everyone my brother is in it. ive tried talking to them logically about it but they wont listen. also, its only reserves which is part time army and i can still keep my day job. the last straw i can take is to ignore all of them and do it anyway but i dont want to do that as you might understand because i would much rather a family in support of me than one that doesnt want to acknowledge the career path ive chosen