Here is where he was operating the 50 cal from:
http://tinyurl.com/4yux5
Here a a picture of the interior of the Stryker - the gunner sits on the right and the OIC sits on the left. The interface in front of the OIC allows him to communicate with other srtykers (text and voice) - they share a common map which shows the position of friendly units, and allows them to mark the position of enemy targets etc.
http://tinyurl.com/6rzyk
Here are the hatches he is talking about:
http://tinyurl.com/6lkfa