This script was leaked at the end of 2013. During this time, although the main thread of story would likely remain the same, some details could have been changed to accommodate new ideas. One simple example of this, the dialogue in the scene with Preston Garvey and his Minutemen (as seen during the Microsoft showcase) has changed. This suggests that the mention of our protagonist being in the army could also have changed. One piece of supporting evidence to the naval idea is the number of pictures hanging in the player's home that have the sea as their theme. Also, there are no large army bases within what we believe to be the general map area. Whereas Charlestown Navy Yard is a short distance away from Logan International Airport, which appears in the concept art, and sits well within the same map area.