On another note, the term ASS-1 is also used in the timeline that appears on pages 54 + 55 in the Macross Perfect Memory book.
I noticed, too, that there aren't any cases of Britai's ship splitting in the TV series. Only in DYRL do we see this. All TV series lineart would seem to indicate that it wasn't a feature in the series. The movie lineart does contain illustrations of Britai's ship splitting as we see in the movie.