The game has unfortunately an error from the Paradox days. This was found in the first patch Paradox released for Hearts of Iron: If and when you load paratroopers into their planes, you can't click to unload them for app. a week or two. Nor let them parajump before a week or two - with the result, that a lot of the paratroopers are dead. Which renders them rather useless, as they aren't quick transported. Sorry, but this matter destroys a good game.