A male human was part of the Alliance Military during the initial stages of the Galactic Civil War. Following Jyn Erso's liberation from Imperial imprisonment by Extraction Team Bravo, this Rebel guided her through the Great Temple so she could meet with the leaders of the Rebel Alliance. He had a helmet on which the letters "MP" were displayed, rendered in a unique Aurebesh font. Similarly, the letter G, in the same font, was visible on his shirt.
Bronson Webb played this Rebel MP, and although he acknowledges the character is difficult to identify in the finished film, he spent eleven days on set filming his scenes.