Gametrailers.com serves millions of trailers a month to media-starved gamers.  And now they’ve been giving a preview of Line of Defense.

Come Tour the Heatwave base from Line of Defense in part I of this walkthrough from GDC 2012. Then tour the different bases, from canyons to frozen tundras, of Line of Defense in part II of this walkthrough.

Check out the posts at Gametrailers.