Radio code?

A: zip ref(?) to follow

B: Roger, over

A: Charlie, satisfactory, Delta, Stopped at base camp, Echo, continue tracking

This is a part of the radio talk(?).
I've heard that charlie, delta thing is just a military alphabet,
then, is A just listing things alphabetically,

or is this C, D, E some kind of a location mark(zip reference)?

Anyone with any idea?