First of all, are you going to be taking a full-scope, or
CI poly ?  If you don't get through the poly, or are
denied the Special Access through adjudication, you
will be put into a database and banned fron all
intelligence work, even at the unclassified level.  If
you already have a DoD clearance, a rejection is
sent back to DSS and they will reevaluate your
clearance.  If you don't already have a DoD clearance,
it will be much more difficult to get one.  I bet nobody
told you about this.  Either way, the poly is BS, and
you will be staking your career on it, every five years.