Halo: Reach Trailer

The trailer opened with a Spartan putting on his helmet before showcasing a Warthog rolling along a trail on the ground of what we believe to be Reach. Several new characters are introduced, sans helmets, including a female Spartan with a bionic arm. She asks the commander if he thinks there are any survivors, to which he responds, "Spartans never die, they're just missing in action."

Source: IGN