Thousands of youngsters have joined the army since October 7 — and it is illegal to refuse. Sofia Orr is likely to become the first woman since then to be jailed for refusing military service, but believes it is ‘wrong to take children and make them into soldiers’
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I was wrong about Denmark citizenship, but look here for an explanation of the tax treaties and the FEIE.
https://www.hrblock.com/expat-tax-preparation/resource-center/filing/20-things-americans-overseas-should-know-about-taxes-for-expats/