Paratroops do not count for stacking, and negate the effect of rivers, but are lost permanently if not adjacent to a friendly unit when eliminated. They may also drop during armoured exploitation. For the first half of the game the German FallSchirmJaeger Corps is the only paratroop unit on the map. Britain and Italy each add a paratroop corps to their forcepools in 1942 (the USSR adds two slightly weaker ones); the USA also has a paratroop corps in her forcepool.