Q: My question is that I am thinking of joining the British army as a officer not really a solider. What does Islam say about a Muslim joining a non-muslim military force? Also what can I do and cant I do? For a example a war against a Muslim country does Islam allow me to still fight against them? Also spying etc on Muslims is that haram?
A: We have not much experience about these matters. When you are not sure about something it is better to keep away.
And Allah Ta’ala (الله تعالى) knows best.