I highly recommend RAT's training in the amazon.I have been with Jeff for the jungle survival training and I would say it is the most intense anywhere you might find in the world.It is the best jungle training anywhere and not only do you learn jungle tactics but you also learn equally important tactics such as interaction with local tribes and city survival.Everyone must remember that at the start and finish of every trip is interaction with locals,its either to get into an adventure or get out of one.The jungle part is easy ,going into an unknown tribe deep in the jungle is downright nerve wreckin.Also the people you work with live what they teach you which makes a big difference,you also can do things you cant in the states such as methods of trapping,tree felling and the such.