It may or may not be extra dialog unlocked by one of the hidden skulls strewn throughout the game, but in my second playthrough of the game, the very second line spoken in the game -- past the opening cutscene -- is our Mr. Fillion speaking over the radio, "Roger that. Reynolds out." Digging around a little online I'm getting that the character is also a sergeant. Hmmm. I wonder why they'd go and do that.
Now imagine a grown man in his early 20s damn near squealing like a little girl.