The helicopter goes to war -- Carving a combat niche -- Helicopter development -- Early days in Vietnam -- Vietnam, 1967 : changes in scale, tactics, and results -- The helicopter as an instrument of compassion -- Changes in helicopters, changes in warfare -- Helicopter development and deployment in the U.S.S.R -- Operations in the Middle East -- Other wars and the growth of foreign helicopter technology -- Appendix one: From before Leonardo da Vinci to 1939 : the development of the helicopter.