Hm, I've encountered an odd desert base(?) map. On the first turn, the first I see as I look outside the Valkyrie drop zone is two dead soldiers. There's no indication I've missed a turn by mistake (no sound of gun fire, etc.). A couple of turns later I look into a nearby building and find two additional dead soldiers, with the exits blocked by a live soldier and a live civilian, respectively, with no enemies inside (although it's a Caesan mission, so in theory a Wraith could be responsible).
Edit: Hm, the corpses must be "decoration", as the number of surviving local forces were 2/5, and there were at least 6 soldier corpses spread over the map (not counting those I know were killed during the mission).