World War Three Will Be 'Extremely Lethal And Fast': US Army Bosses Reveal

It is a chilling vision of war - and one unlike any other ever fought.

US military bosses have revealed their predictions for a major conflict, and say war between nation states at some point in the future 'is almost guaranteed'.

Artificial intelligence and smart weapons would be at the fore - with a 'modern nation-states acting aggressively' the likely enemy.