You know what's pretty American? SWORD FISH! We don't know either but still great.
Taser: The same could be said for the Taser, which you can expect to see a lot of in a post-apocalyptic hellscape, at least as long as they can stay juiced up.
Surcouf – Between the years 1934 and 1943, the French Surcouf was the largest submarine in existence.
Japanese I -7 Aircraft carrier submarine, that's right the Japanese made an aircraft carrier submarine.
Tactical Pen: People might make fun of your tactical pen now, but after they’ve all died in the apocalypse you’ll have the last laugh, and the last sharp blade.
Pepper Spray: Put aside any of your macho prejudice, because after society falls sometimes you want to blind or incapacitate without sending anybody to Hell.
AK-47: The most recognizable weapon in the gun world is also one of the most powerful, and durable. While probably don’t need one now it might be helpful once every structure of law enforcement and civilization collapses into dust.
Rinspeed sQuba – Inspired by James Bond’s underwater car in The Spy Who Loved Me, the Rinspeed sQuba is the world’s first real combination car submarine.
Swiss Army Knife: With a classic Swiss Army Knife than someone who’s trying to fend off looters and mutant killers with their bare hands.
Glock 19: Stick a Glock 19 in your waistband or even one of those spring-loaded wrist-holster things from Taxi Driver and you’ll be the deadliest warrior on what used to be your block.