Uprising - Terminal - Midway through the level, after fighting a Wraith in an open area at the end of sniper valley, you'll go into a door and find a weapons stockpile room. Just before getting to this room, you'll be on a walkway outside. Check behind the pillars to your right when across the bridge from the door leading into to this stockpile room to find this one. This one starts at 18:08
in the video.