The authors would like to express our thanks for the understanding, patience, and support given to us by our families, especially our wives, and by our colleagues. We would also like to thank the numerous government agencies and technical points of contact behind the grants that supported the research results reflected in this book: Department of Defense – NAVAIR, NAVSEA, Air Force, and Army, NASA, and the US Department of Energy. We also acknowledge the support, understanding, and encouragement we received from the staff of Wiley books. Last, but not least, we acknowledge the support and assistance of our staff editor, Richard Thompson, provided in the way of logistics, editing, coordination, and liaison‐especially with the Wiley staff.