Various countries have this, like Switzerland. Taking a guess based on the name I'd say Croatia? I think they may have had this in the past.
You are right, it is Croatia. Our military service was obligatory for a long time. At one point we could issue a "conscience objection" and serve as a civil service for 9 months instead of going to the army for 6, which I decided to do.
After 9/11? No.
OP is not a US citizen- “working for a US company”