my son has dual natioality he was born in britain and has lived here all his life we got him turkish nationality just after he was born because his father is turkish he now wants to enter the royal navy who say he needs a letter saying the turkish army will not require him for national service now or in the future after ringing the turkish consulate they say they can not do this because his kimlik card was issued in turkey and so he is turkish can you help with some advice thankyou