Finland has mandatory military service for all able-bodied men. The summons come to every man on the year they turn 18, and your service status is visible on your government records - whether you've done your service, are yet to be summoned, or deemed excempt from service and for what reasons. Even if you're blind, deaf, in a wheelchair and cognitively impaired, you still need to show up for the evaluation, though ideally you'll already have a doctor's note for the occasion that basically just says "I mean just fucking look at this guy", and the military doctor will look at you and go "yeah" and sign you off as unfit for service for the time being.
And if you get your legal gender changed, your military status updates accordingly. When I got my gender marker changed to male in my late 20s, I automatically showed up in the government systems as an adult male who has not done military service yet, and I got summons the same year. However, back then being transgender was a diagnosis that you need a doctor's evaluation on, and being trans was one of those medical conditions that give you the option to opt out of service - in the "you can go if you think you can handle it" way, but you have no obligation to volunteer. So I didn't.
I met a friend recently who mentioned that he's going to wait a few years yet before getting his gender legally changed, so he can age out of the conscription system and avoid summons altogether. I said that I was released from service due to trans diagnosis, and asked if he can't do so as well. He said no - the law has been changed since I transitioned, and now that you no longer require a medical diagnosis to be trans, it is also not a diagnosis that'd make you excempt from the military.
So the finnish government basically just said "if you're a grown man with nothing wrong with you, then you're a grown man with nothing wrong with you. Now grab this fucking gun and do your duty for fatherland."