I spent 20 years in the US military. I had to quickly learn “military time” in order to function, as we were taught 12-hr time growing up in school. I was surprised when I traveled the world and discovered that everyone else uses “military time” (read: international time) as well. I guess Americans just really wanna do their own thing.
I exclusively use military time nowadays. If someone doesn’t understand the time I stated, I’ll correct it to 12-hr time on the spot, as converting is super easy. Just count back 2 hours and drop the 10’s digit by one; e.g. 1600 = 4 PM. 2200 = 10 PM. Etc.