Only appear once a 'kill requirement' is met (e.g. The Skulls for each level of Campaign mode will Note: Check out tips on every level Achievement in our walkthrough. Open it by highlighting it and clicking A and clear a path to the transport for him (he goes down in one shot, so watch out!) and you'll get the Achievement. Down here is a door which Adam, a small child, is trapped behind.
Look just north of the starting point for a tower with the level's Black Box at the bottom.