On the Silent Cartographer level, after you unlock the door that leads to the map room, you will hear a call for help from a pelican under attack and inevitably crashes, leaving you a rocket launcher. The pelican crashes next to a butte with jackals on top. Drive a warthog on the catwalk (on the ocean side) that leads to the top, and drop down on the pelican. While still in the car, wedge yourself in the space between the cliff and the pelican until your practically sideways (with the tires facing the rock). Jump out, and you'll be inside the pelican's cockpit with an inside view of the control panel and all of the little details Bungie put in there.