You can join the unit now without apex, however apex will be required at the end of our current deployment (around end of summer/fall). At that point you would hopefully have apex thru a steam sale or regular purchase. If you didn't have apex at the time it's required you would most likely have to transfer to our reserve section until you obtain a copy.
Edit: reference to apex requirment is in our unit application as a yes/no question.
Do you understand that as of 30SEP2017 you will be required to own Arma 3 Apex DLC in order to actively participate in the unit?