in support of land and amphibious operations. It is fitted to over 15,000 military vehicles, from Land Rover Wolf to the Challenger 2 Main Battle Tank. The entire Royal Navy fleet is fitted with Bowman equipment as are all the major helicopter types supporting land operations, such as Apache, Chinook, Merlin and Lynx. Bowman features enhanced communications security (COMSEC) through integrated voice and data encryption devices and enhanced electronic protective measures through features such as frequency-hopping spread spectrum. It also provides tactical situational awareness for commanders through GPS links, helping to reduce the probability of friendly fire. The cryptographic core is based on a Pritchel II High Grade algorithm designed by CESG. The complete contract involves more than 48,000 radios (excluding the 45,000 Personal Role Radios) and more than 30,000 computer terminals being installed in more than 30,000 platforms, together with the necessary training of around 75,000 Service personnel. The Bowman system is a fundamental part of the British Military, achieving a Network Enabled Capability, providing the carriers for the passage of data between the various software applications involved. It is related to the Future Integrated Soldier Technology concept. The procurement and support of Bowman is led by the Battlefield And Tactical Communications and Information Systems (BATCIS) delivery team, for many years within Defence Equipment and Support, now part of Information Systems & Services at MoD Abbey Wood. Equipment Nominally the lowest deployed part of the Bowman series of radios is that provided by Leonardo-Finmeccanica (previously Selex ES), in the form of the UHF H4855 Personal Role Radio (PRR), which is primarily used by infantry fireteam (section level and below). PRR is only partially connected with the Bowman programme, as it was hived off from the acquisition process in October 1999 for more rapid implementation, and the first of 45,000 units formally entered service in early 2002. Operating in the 2.4 GHz band, PRR had no integrated encryption devices and does not intercommunicate with the rest of the Bowman network, but is widely acclaimed as having revolutionised intra-squad communications and small-unit tactics. Models are designated "UK/PRC", which stands for "United Kingdom / Portable Radio Communications", or "UK/VRC", which is "United Kingdom / Vehicle Radio Communications". Following this logic "UK/ARC" stands for "United Kingdom / Airborne Radio Communications". VHF radios VPT - a UK Type 1 (Pritchel) encrypted section to platoon-level UK/PRC354 5W VHF Portable Transceiver (VPT) ADR+ - an enhanced