Great to see you back, Chief, and almost in fighting shape!
—Greeting the player.
Dozer is portrayed as loud-mouthed and wise-cracking outside of combat, though he appears to be more level-headed when fighting begins, as evident from his attitude when dealing with Jones on the radio during missions.
Dozer is a part of the player's squad, and as such crosses paths with the player quite often. Dozer is first seen in the level Back in Business, standing next to Jones, holding his trademark M249. The player is paired up with him multiple times, notably in Subterranean Blackout, where he assists the player in the hunt to capture Abu Bahaa. Dozer was heard voicing his suspicions over the radio about the enemy's level of preparation multiple times, claiming the squad may have been betrayed.
Warning: spoiler below. Move cursor to read the text.
Booyah, Bahaa! Didn't see that one coming, did ya, buddy?