Iraq had decon units available and Powell's speech to the UN indicated that they used them, at least some of the time. The further you proceed down that logical branch, the more likely the transport vehicles you note were moving inert casings. If this was an Iraq-wide operation, then orders to other special stockpiles routing through Dijla are worth searching for.
Moving in the other direction, the more you lean towards this being an order to transport active munitions, the more likely movement orders exist ordering similar transport from An Najaf to other commands.
Good news either way.
Keep up the excellent work.
Indeed most of the 262 pages documents is about troops movements and ammunitions movements. Only this Top Secret memo that use the term "Special Ammunition".