Finland doesn't have compulsory military service to help people feel connected to their society. Feeling connected to one's society is not an end in itself, people should be free to choose how connected they want to feel. Finland has compulsory military service because it's a small country that borders Russia. The US is a big country that borders Canada and Mexico.
Yeah, if anyone maybe needs compulsory service, it's Mexico and Canada (to protect against the threat of the US), not the US.
> people should be free to choose how connected they want to feel
Yes and no. Of course people should be free, at the same time you live in a society and not a state of nature.
If someone never has to put back into society, that's dangerous. It could lead to people feeling that society has no value, that there's no sense in investing in it, that since nobody else cares why should I.
That's not a world I want to live in.