Yes, any Irish or commonwealth national can join the British armed services, although an oath to HM the Queen is mandatory.
Yes they can.
Inorder to join either army you must be a valid citizen
No, Ireland and Britain are different countries, you would have to leave the Irish Army, then try to get permission to join the British army
Become a British subject (citizen) then apply.
You have to be a US citizen to join the US marines i think its actually permanent resident
Yes, an Irish person has to take an oath of allegiance to the British crown if they decide to join the British Army.
my name is nganga john karanja i want to aply british army
No, The only people who are eligible to join the British Army are British Citizens, who are born in Britain. Citizens of Nepal can join the Brigade of Gurkha's. Commonwealth Citizens may join the British Army, if they meet all the elibility.
You have to be a citizen to join the army.
No. Not unless you become a UK citizen, as required by every other post in the British Army.
You cant join the British Army unless you are a citizen of either Britain or a commonwealth country. An American would have to live in the UK for 5 years and then apply for citizenship before joining the British Army.