At school and in Scouts we learned flag etiquette; it drives me nuts when flags are left up 24/7 or flown in tatters.
Growing up, there were a few folks in my community with proper flag poles who used them properly; I suspect they were WWII or Korea vets and have mostly passed on because there aren't as many nowadays.
We have had a lot of POW-MIA flags in my community since Vietnam; they are flown with the USA flag. When I see a USA flag, most of the time there is a POW-MIA flag flying with it.
I also see large USA flags flying from the beds of pickup trucks.
A neighbor had the stars-and-bars hung on the front of their house for many years; don't know what was up with that as we aren't a Confederate state.
I see a lot of "Don't Tread On Me" Gadsden flags too; sometimes it's USA, POW-MIA, and Gadsden.