hi, been lurking for a while. actually, you're both correct. city area is named Battle 25, and the macross class ship up front is called M25. will try to post screenshot once i get home.
edit:
oops, i guess i was wrong with Battle 25. here are the screencaps:
shows "macross 25"
and here it shows "frontier"
dunno if battle 25 (connected to macross quarter & frontier) is actually pointing to the city area. oh well.