Not all add-on armor is created equal:
Pakistani soldiers patrol during the curfew in the restive Swat valley, Pakistan, 18 August 2008. More than 120 people, including 14 law enforcers and two dozen civilians, have so far died in the skirmishes between Pakistani security forces and pro-Taliban militants. Tensions rose in the scenic valley, located about 300km north-west of Islamabad, when the military launched a crackdown on the supporters of radical cleric Maulana Fazlullah after he began a campaign to impose Taliban rule in Swat
Could do the trick against an RPG, though. Murdoc’s guess is that there’s no money in the budget for an active protection system this fiscal year.
UPDATE: Now that I think about it, that thin corrugated steel (or whatever it is) isn’t going to set off the warhead, is it? Better hope that that trash stuffed in there keeps it from hitting the hull armor.