Written by Mr. Mouseburger 6th Jun 2005
Billy is a Navajo in a top secret super-elite-mega-special ops unit that is being sent into an unnamed Asian theatre or war to rescue some hostages.
He has a steely cold outlook on life, having been bottle fed on injustices of his people over the centuries, and so is completely unfazed by most atrocities in the film (i.e. Arnie's acting). Also, being Navajo he is, by default, something of a seer, prophesying the death of the party early in the film with a suitably macho "we're all gonna die".
The Predator killing off Dillon (q.v.) is the final straw for Billy so he decides to meet his fate head on, and makes a last stand on a log bridge over a very nice ravine. Dutch tries to reason with him (for about 3 nanoseconds) then decides to leave him to it and dash like a sissy girl to the helicopter rendez-vous point.
To show how tough he is, Billy throws away his gun, draws his knife and proceeds to cut his chest without flinching. This is important because when you hear his off camera girlish scream seconds later, you know that the Predator must have done something terrible to him.