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There should be more higher up ranks to do tryouts so some others can join the battalion they really want for example the SoS SS theres only 1 person that can do tryouts for this but this person is almost never on anymore I heard
SoS SS is a paid for job which costs a hefty amount of money. Regular SoS tryouts are held by Low Command and above. If you’re interested in being in any regiment I would say that you should talk to regiment leads if you see them on in the Tab menu.