July 15, 2005 Our recent story on the World's toughest bus which has been used to defeat many ambushes in Iraq caused a lot of reader response, so we thought it might be worth noting the United States Army’s US$500 million purchase of an additional 724 Armoured Security Vehicles (ASV) to protect troops in Iraq. The ASV is a 4X4 wheeled armoured vehicle that provides crew protection against medium calibre armour-piercing machine gun fire, large artillery projectile fragments, and land mines. The advanced exceedingly lightweight ceramic armour allows the vehicle to be able to "roll-on/roll-off" C-130 military transport aircraft. ASV’s off-road performance includes the capability to ford water depths of five feet, climb gradients of 60 percent, and overcome obstacles 2 feet high. Unlike many other vehicles, the ASV enables the crew to load, reload and clear gun jams under full armour protection. Special run-flat tires with central tire inflation offer the crew added mobility when under fire. When faced with nuclear, biological and chemical threats, ASV’s gas particulate air filtration system, used in tandem with a ventilated facepiece, offers additional protection.