Islamically can you join a national army...

Re: Islamically can you join a national army...

To save time I'm only giving one example this should be enough for you inshaAllah.

Sahih Bukhari *Volume 4, Book 52, Number 43: *

Narrated 'Aisha:
(That she said), "O Allah's Apostle! We consider Jihad as the best deed. Should we not fight in Allah's Cause?" He said, "The best Jihad (for women) is Hajj-Mabrur (i.e. Hajj which is done according to the Prophet's tradition and is accepted by Allah)."