We recently went through the members of FK's ARMA 3 unit and did a little cleanup of the members. People who basically haven't been on in a long time etc were removed from the unit as the number of people in the unit started messing it up to the point where changes weren't being saved.
However, some of you may have been wrongfully removed as the system in place is not exactly the best (literally the page wouldn't update sometimes when removing people so it may have removed the wrong person when removing the next person etc), or you may have a different name there to your given name.
If you find that you have been removed and think it is in error, just make another application using the password.