From Halopedia, the Halo wiki
"They're right behind us!" is the only line of Crewman 1, voiced by Matt Soell, left in the game. There were other lines, but in the words of Martin O'Donnell, there was "no space on the disc for a guy with no discernible acting skills and a singing voice like a mule in a garbage truck."
Crewman 1 Spin-off
Initially thought of as a joke, Marty spoke of creating a game around Crewman 1: