I think they may give you the identifier rather than the name as a convenience to you IF you file /G. Maybe they use identifiers because you do…? I came away from my training with the understanding that you say the name and write the identifier. That may just be the way I understood it as my mind processed the information. If I don’t have a GPS, then I think it’d be easier for me to distinguish “Mount Soledad” from “Qualcomm Stadium” on a chart as opposed to distinguishing “VPSMS” from “VPSQS”. Guess I’ll learn more about how it works when I get enough balls to go into the Washington TCA someday 
They also show three RNAV waypoints (VPSCF, VPSMV and VPSMB) in the vicinity which, as I understand it, are only to be used in RNAV operations. I think ATC can give those to you if you show GPS or Loran equipment as an equipment identifier on your flight plan. I may be wrong about that.
