Some questions

If the DMZ is a dmz, then why are there so many troops there?

If American football (should be called pigskin, if you ask me) has little to do with using your foot to do anything to any ball or object that is called a "ball", then why did it take the name of a game where the foot is one of the main transporters of the ball, and cause the name of said game to be changed?

If the apostrophe can be used to show possession of something, instead of as a contraction, then why is it not used in the possession form of "it" (it's)?

"Its" is a word of it's own afaik.

comes from the bases of kicking a ball with the foot in an attempt to score a goal. In english speaking countries, the name was familiar and recognizable, so there didn't need to be a name change.

other countries "football" =soccer. in spanish speaking countries, I believe it's called futbul, and futbul americano for english football. probably not all entirely accurate, but I'm sure there is some article about it.