This training is not to pledge allegiance and it is not to fight by their sides. It is to learn from them and to train Muslims how to fight. Therefore, it is permissible.

I understand joining the kafir forces like Britain, America is haram. However the pakistani goverment is sending a handful of troops to train with the British SAS (Special forces) so they can come back and create a new Special forces unit in pakistan for the muslims inlight of the recent attacks on school etc. Is this co-operation halal if not I shall advise inshallah?