The General Dynamics F-111 was one of the most technically innovative designs among military aircraft, introducing the variable-sweep wing, terrain-following radar, military-rated afterburning turbofan engines and a self-contained escape module among other features. Designed as a cost-saving, multi-role interceptor, naval fighter and strike bomber, its evolution prioritised the latter role and it became the USAF's most effective long-range strike aircraft during three decades of service. Rushed into combat in Vietnam before some of its structural issues were fully understood, the type...