Not so much Tough to Kill as Probably Quite Easy to Kill, as the main character gets a bullet in the leg early on in the film and is carried around alot in the jungle. Poor bloke doesn't really get a chance to prove if he's tough to kill or not until nearer the end of the film. Even then, I'd rate my chances if we had to fight it out in a sweaty jungle...
Our main protagonist Martin (Luc Merenda)...