size, the Terrex is air-portable by C-130s or other similar cargo aircraft. The Terrex's layout is conventional: the driver sits front left and the power pack is to the right. This leaves the rest of the vehicle clear for the troop compartment, which is provided with a power-operated ramp and roof hatches. Various weapon systems can be fitted on the roof, including a remote weapon station armed with a 40mm automatic grenade launcher and a 7.62mm coaxial machine gun or a complete stabilized turret armed with a 25mm M242 Bushmaster cannon and 7.62mm coaxial machine gun. Additional 7.62mm machine guns can be mounted over the rear troop compartment. In addition, the vehicle can be configured to carry varying combat payloads, from turret-based weapon stations (including 105 mm tank guns) to rocket launchers. The modular top deck allows for quick configuration changes to be carried out. The Terrex AV-81 uses a patented independent double wishbone suspension, which greatly improves ground mobility and ride comfort over rough terrain. The use of automatic traction control and the capacity for large footprint off-road tires enables it to travel at unprecedented speeds in soft ground conditions. The vehicle has a double hull with an external V-hull that improves mine blast survivability. Add-on armour provides further protection for troops. It is also capable of providing full NBC (nuclear, biological, chemical) protection in extreme operational conditions. The standard equipment includes a powered steering on four wheels at the front, a central tyre-pressure inflation system, an anti-lock braking system and an NBC defensive/protective system but there are also many other options for fitted equipment and vehicle gear available. In its baseline configuration, the AV-81 Terrex is fully amphibious: two water jets mounted on either side at the back of the hull propel the vehicle through water at 10 km/h. Variants The following known variants are in service: Command Variant 40mm AGL/7.62mm Coaxial MG Variant .50 calibre HMG Variant SPIKE ATGM Variant Pioneer Variant Medical Variant Reconnaissance, Surveillance, and Target Acquisition (RSTA) Variant STORM Variant Incidents On 23 November 2016, nine Terrex vehicles from the Singapore Armed Forces (SAF), which were used for a military exercise in Taiwan, were seized while in port at Hong Kong, resulting in heightened political tensions between Singapore and China. They were initially impounded at an outdoor storage yard of a Hong Kong Customs and Excise Department storage facility in Tuen Mun, but by