Pete:
I didn't see your questions earlier.

1: Yes some, in the military.
2 and 3: Both in the field and at home: I hike and go out camping very often. But, it would be nice to have a kit at home in case of an unfortunate event/disaster where transportation to/from the hospital is impossible or when local facilities are overwhelmed with more serious injuries than a cut to the leg or a ruptured tendon.