No, I'm not. I understand the single measure repeat. it just so happens that a repeat bar (i think) exists in the conductor's score, and the 1st ending just so happens to start somewhere arround that measure.
I just checked all the parts and score at bandpdf.org
. Some parts are written out, and some have 1st and second endings. The score has 1st and 2nd endings.
If it were me, I would send the VP of Parade Adjudication a copy of the score and several parts, both those with and without the repeat, and ask for a ruling.