I've posed a few questions - under Rules Discussion.
Re. Army baggage command - I read it that it doesn't roll a die, it is considered an Irregular command as it has no General [pg 14, para 1 & 2] but it uses the C-in-C's PIPs [pg 26, para 10, but para 4 on pg 14 slightly confuses the issue but I feel the intention is clear - no PIP die].
Cheers
Jack