The factors by which countries were included to this list were numbers of troops, budget put into military, total machinery active (ground, naval and aerial), and both past records of battles and future plans for military development.
Bill Gates takes part in a rather unusual project every year. He adds a paper with his name to the hat and turns himself into a Secret Santa. And every year one of Reddit subscribers gets their dream gift from Bill Gates himself.
Nothing is impossible for moviemakers nowadays. They can turn actors we all know and love into characters we would have never guessed those actors even distantly could look like. It just takes some make-up and modern high-end technology.