to keep running. These new missiles were mounted on a simpler flatbed trailer containing four missiles each. This new system was dubbed the Exactor 2 by the U.K. Ministry of Defence. 18 such systems now exist within the Royal Artillery in six batteries of three. Centurion Centurion is a C-RAM system based on the 20mm Phalanx CIWS, originally acquired for use in Basra, Iraq. It is operated by 16th Regiment Royal Artillery, and intended to intercept incoming rockets, shells and mortars out to a 1.2 km square area. They are maintained by Babcock International in the United Kingdom. A total of ten sets were purchased in 2005, but since then four have been reconverted back to the maritime variant. Engineering and logistics Miscellaneous C vehicle fleet The job of the Royal Engineers is to restrict the enemy's ability to advance, while also allowing friendly combat forces the freedom to maneuver as necessary. Other tasks undertaken are bomb disposal, the construction of fortifications, runways, roads and bridges and the improvement of existing infrastructure to support operations – such as improving existing roads for logistic convoys. To achieve this, the Royal Engineers operate a large and diverse fleet of vehicles. At present, the C vehicle fleet is provided by a private finance initiative (PFI) and consists of some 2,500 vehicles of over 160 types of "earthmoving plant, Engineer Construction Plant (ECP) and rough terrain Materials Handling Equipment (MHE)". The provider of the PFI is Amey Lex Consortium (ALC), which was awarded a 15-year contract in 2005 for £600 million. The handing over of the C vehicle fleet to a PFI has improved overall efficiency, with ALC selecting common chassis for multiple roles and significantly reducing equipment types. This has led to reduced training needs in personnel, commonality of spares and an overall reduction in the logistic footprint and cost of maintenance. ALC maintains the fleet at various degrees of readiness, with a large pool of the vehicles being modified and adapted for military use – however, the majority of the fleet is maintained at commercial standards. The fleet is dispersed worldwide to accommodate both existing and future operations. When in use, the vehicles are essentially being "hired on an ad hoc basis". To help sustain the C vehicle fleet on operations, the PFI includes a logistics support package. All-terrain vehicles There are a number of all-terrain vehicles in service with the British