Speaking from someone who wears the Ranger tab I can say there are people from allied nations those people are usual officers and the majority right now are from the middle east, I bared witness to a fellow from Kenya. 6 slots a year? Good luck in getting one of those, I also knew that soldiers hear beat there head to get the course. I was lucky and I realize that, the only ones that get the right to go are American officers along with lads from battalion whom are spc and above (coming back from tours), if they are not chosen to go then they will be weeded out of Ranger Bat. You can find 2 versions of the Ranger manual on the internet make sure it is the updated one. There is a wide range of field manuals on the internet just search around. Take care