@Novichok, not every woman is a little Suzie... lol
But, yeah, I'm a "little Suzie" myself and I would be unfit for a soldier in a combat role.
In the ideal scenario only people who are fit to be soldiers become soldiers, but in times of war, when your country is being invaded, you may start running out of men and women may have to fill in some gaps.
From what I've read there's shortage of candidates for soldiers in the US army. The same is with Polish police - somehow those brave, big men don't want to serve the society as police officers. So the Polish police is hiring whomever is willing, including women. I don't know about you, but I'd rather have a female officer answer my call in case of emergency than noone at all:
bbc.com/news/world-australia-68806806