the Trojan Combat Engineer Vehicle (CEV) based on the Challenger 2 chassis. Trojan will be equipped with an articulated excavator arm, a dozer blade and rails for fascines. 33 units have been ordered from BAE Systems Land Systems Operational history Churchill III and IV AVRE vehicles were successfully used to breach defences in the D-Day landings, and continued in use through the rest of the allied advance to Nazi Germany. The Petard Mortar's ability to demolish obstructions and fortifications proved valuable to the allied advance, while the morale impact of seeing the large gun caused many enemies to abandon their positions. AVRE vehicles were frequently teamed with Churchill Crocodile flamethrowers for bunker clearance. The AVRE would crack the defences, allowing the flamethrower to soak the interior with flammable liquid, forcing those inside to surrender. Centurion AVRE and Chieftain CHAVRE vehicles were both successfully used in Operation Granby in the early 1990s. Extended use of the Centurion AVRE made the Centurion tank, developed during the latter half of the second world war, the longest serving military vehicle in the British Army. Attachments and accessories Demolitions The Carrot provided explosive charges on metal prongs extended from the front of the vehicle. These could be pushed up to an obstacle, released, and fired from within the vehicle, protecting engineers from the need to exit the safety of the armoured vehicle interior. Onion built upon the Carrot concept providing a much larger frame of explosives to blow a larger gap in concrete obstacles. Goat provided a similar frame of explosives to Onion and Carrot, but carried horizontally to allow a much greater charge to be carried. This was released by prongs extending from the front, allowing it to pivot into a vertical position before detaching from the vehicle. Mine clearance During World War II the Sherman Crab was the primary (and most effective) mine clearance vehicle for the 79th Armoured Division, but AVREs carried a range of mine clearance devices to supplement them. A Lane marker attachment could be fitted to the sides of the AVRE to delineate lanes through minefields or cleared terrain. Similar to the Sherman Crab, it deployed both tape and lights. Snake was a mine-clearing line charge consisted of sections of 3-inch pipe filled with explosive to extend and then detonate across a minefield. The concept is similar to the bangalore torpedo but Snake is much larger - Snake pipes