A couple of reasons . . . The SSBI investigators do not know anything about immigration and asylum law and they cleared him to go to BCT but then USCIS (a different agency) figured out that he was a member of a Tier III group. The SSBI investigators don't have a list of the Tier III groups. Second, sometimes the Army was letting MAVNIs ship before the SSBI was completed. They stopped doing this recently, but they were doing this up until a couple of months ago.