A new Lynx Mk9A helicopter operating at Camp Bastion, Afghanistan, in 2010 after receiving upgraded engines that allowed it to operate more effectively and reliably in 'hot and high' conditions

The ubiquitous UH-60 Blackhawk has been a mainstay for the US military for decades, but will be replaced by a new clean-sheet design

An artist's impression of Sikorsky's Raider X entering a clearing with ground forces

Several replacements for the OH-58 had been sought and then discarded, often after considerable investment

An artist's impression of Sikorsky/Boeing’s SB>1 Defiant airlifting an artillery battery into position Lockheed Martin

An artist’s impression of Bell's Invictus 360 attacking a target