By the way, my Vietnam data above was meant to be about the Vietnam war and only contained reference to the metric system because of the picture I was lampooning.
The metric system is vastly superior.
I remember in my younger days when the US made the attempt to switch, but it didn't work, mainly I believe because of only a few ingrained measures (miles, miles/hour, pounds, and fahrenheit) -- basically driving their cars, temperature, and weight of heavy things (like how much a person weighs) were the points of stubbornness. Everything else is fine in metric -- folks are used to nuts and bolts in mm (thanks to Japanese motorcycles), volume in liters (thanks to the ubiquitous 2-liter bottles of soda), and grams of things in food.