 Operational research also looked at the benefits of giving the ACV a through-the-barrel (TBM) as well as the equivalent of 400mm of additional armour.The research found that such improvements gave the ACV MBT-like firepower but still left it unable to manoeuvre in the presence of a capable enemy.In September 2006, conventional fighting in the Panwayi district of Afghanistan in September 2006 led to a rethinking of the ACV plan.