One way to gauge the toughness of a movie combat unit is by observing how hard they are to kill - and Predator is a movie that takes this concept quite literally.
Looking back on it, the cast of Predator was badass enough to rival The Expendables: you had Arnold Schwarzenegger as "Dutch" the tough-as-nails leader of an elite American commando unit, and a team that included the likes of Bill Duke (Menace II Society), Carl Weathers (Rocky), Jesse "The Body" Ventura, writer/director Shane Black (Iron Man 3) and of course, Sonny Landham as "Billy" the Native American commando who faced the Predator with nothing but his Bowie knife. How much more badass can you get?
All you need to know is that these guys were so badass that an alien hunter came all the way down from space just to battle them - and that alien ultimately went home in a body bag. 'Nuff said.