Vertical take-off and landing (VTOL) - or 'jump jets' - have the combat performance of a fighter, combined with the ability to take-off and land like a helicopter. Harriers have seen extensive combat service around the world since the 1982 Falklands conflict, while US and British F-35s are starting to see combat in increasing numbers in global hotspots. The unique features of these jets mean they have carved a distinctive niche in military aviation and this 116-page special is dedicated to the technology in service with British, American, Italian, Spanish, Thai, Japanese and Russian units.