The Challenger was built by the Royal Ordnance   Factories (ROF). In 1986 ROF Leeds (and   the Challenger production line) was acquired by Vickers Defence   Systems (later Alvis Vickers). The   Challenger design by the former Military Vehicles and Engineering Establishment   (MVEE) near Chobham in Surrey originated in an Iranian order   for an improved version of the stalwart Chieftain line of tanks in service around the world. These   were the Chieftain Mk5(P)- FV4030/1, FV4030/2 Shir (Lion)1   and 4030/3 Shir 2. With the fall of the Shah of Iran and   the collapse of the UK MBT80
 project, the   British Army became the customer and the tank was 
further developed by   MVEE to meet Western European requirements. For a
 short time the tank   was named "Cheviot"  before becoming "Challenger", a name reused  from a cruisertank of the Second World War.
The most revolutionary aspect of the Challenger 1 design was its Chobham armour which gave protection far superior to any  monolithic Rolled Homogeneous  Armour (RHA), which was the then standard of tank armour material.  This armour has been adopted by others, most notably the American M1  Abrams. Additionally the Hydrogas
 suspension fitted provided outstanding  cross-country performance 
through the long suspension arm travel and  controlled bump and rebound 
behaviour offered.
Challenger 1 competed in the Canadian Army Trophy
 Competition in 1987. It scored  more direct hits than its competitors, 
but  the poor fire control system and sights caused it to be the slowest
  firer, and it was placed last in the league tables.
A
 requirement for a new MBT was issued. Proposals put forward for the  
new specification included an improved Challenger from Vickers, the  
American M1 Abrams, the French Leclerc,  and the German Leopard 2.
The Vickers  Defence Systems
 design, designated Challenger 2, was eventually  selected. This tank 
was significantly more capable than its predecessor,  based on the same 
basic MVEE-designed hull but with a new turret based  on the Vickers 
Private Venture Mk7 design and improved Chobham armour.
There was also a Challenger Marksman SPAAG version, equipped with the Marksman  turret". 







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