You weren't in the guard, logistics at least according to those I know still in the guard, have confirmed there is no instructions on how to get ammo and magazines. of course I cant confirm this due to OPSEC but really, the evidence shows that they are not armed and could not be given ammo and magazines in "minutes".
furthermore, lets pretend you are right. if this was the mega insurrection civil war, your ilk thought it was, why not arm them, unless you all dont' really think there is a threat
So, you have no better information than I do. I can only go by what we did in the Regular Army and the ammo would already be load in the mags and the mags available if needed. I can only assume that the NG knows they still need to be prepared.
Not my call, I would arm them with ammo, but do keep in mind that the NG are not Police and would not follow their rules of engagement and if the Regular Army were deployed all bets are off, so I think those in charge are trying to walk a fine line.