After landing on Halo, I was able to finish the 2nd part of the level, where you're defending the survivors and 6 dropships land around a central site, while keeping Sarge alive. He then jumps on the back of the Warthog, and delivers some cute quotes: When driving too fast, he says, "Hey, slow it down, Luke of Duke!" When you kill one of his men accidentally: "Do me a favor, stop killing my men!" He may do all this on different levels, but I did this on Legendary (it took a lot of tries). I'll post more as they come up. I'm playing Halo again because I just got a new video card, and it's a great game as always.