This is my favorite Tom Clancy novel period, despite not having Jack Ryan among its large cast of characters. The Soviet Union launches World War Three when it finds itself facing a major energy crisis, and it turns out the story's hero is Mike Edwards, an Air Force weatherman/meteorologist turned guerrilla-fighter, who keeps the US informed of the developing situation on Iceland after it is captured by the Soviet Union. 
 Lots of high-tech air-sea-land-and even-space combat delivered at a break-neck pace by the master of the techno-thriller, Tom Clancy. Too bad he didn't find a way to include John Patrick Ryan and include this book in his series of Jack Ryan novels. 
 In the end, the Admiral in command of the Allied invasion fleet that retakes Iceland (thanks to Edwards' vital intel), visits Edwards aboard the hospital ship, pins the Navy Cross on his pillow, and says, "Congratulations, MARINE!" 
 "But, Sir! I'm Air Force!" 
 "Son, this medal-says you're a Marine!"