IamA Finnish-American who just completed Finnish military service, AMAA!
I just finished serving six months in the Finnish military. The wikipedia article on Finnish conscription does it justice. It should be noted that I did it voluntarily and later than most conscripts, since there's an agreement between my two countries stating that, in essence, it's not compulsory for dual citizens from the US.
I'm a 23-year old dual citizen who's lived most of his life in North America with my Finnish mother and American father. I had been to Finland roughly every other summer, but my Finnish was still pretty weak going into it. It's my dream to live in Finland one day, and I figured that intti, as it's called, would be a good way to get my foot in the door. Ancillary goals were to learn Finnish, get into better shape, meet Finns, and have the intti experience that many Finnish men have.
I served in the Frontier Jaegers at Onttola, finishing on June 19th. I should note that my experience has been quite different from what someone in the normal Finnish Defence Forces would have had (the Frontier Jaegers are part of the Border Guard, which is under the Ministry of the Interior, unlike the FDF), so if you're someone considering doing intti, I can recommend you another redditor to ask. I just got back from celebrating Midsummer (Juhannus) at a summer cabin, which is why I'm a few days late.
There are some rules that I will abide by that forbid discussing specifics of how/what we trained, sharing names of other people, and revealing sensitive information. But feel free to ask about anything, and I'll answer to the best of my ability within that. AMAA!
Edit: Apologies for the slow responses. This got a lot more popular than I expected.
Edit II: All righty, folks, it's just about 1 AM here in the land of 'almost as many lakes as mosquitoes'. Keep on asking, and I'll answer in the morning.
Edit 3: And I'm back. Good morning!
Edit four: Just so we're clear, neither I nor anyone else that's gone through the 6 to 12 month period of service could be called a "professional" soldier in the sense that one might be used to with, say, someone who served in the US military. We were training for the reserve. As such, instead of any kind of salary or pay, we got 5 euros per day as "spending money," (very generous in my opinion) along with room and board at the barracks.