Red Shift: Jim Cahill Time Travel Series — Robert P. Fitton

Al Qaeda is a threat, but in 1986 US cities were vaporized in a nuclear holocaust. Nuclear devices vaporize US cities and Jim Cahill must travel in time to 1962 to prevent the attacks. Before September 11th, Osama bin Laden, and the threat of Saddam Hussein, Jim Cahill faces, Carlos Sanchez, a ruthless nuclear terrorist. Inside Hastings Mountain, under attack in Colorado, Ray Meinkewitz attempts to send Cahill and his fiancé two years back in time. Cahill must prevent the present day nuclear annihilation of American cities by Carlos's aligned terrorist groups. But he is brought back to 1961. The intelligentsias of that period grill and browbeat Cahill. Cahill and a younger Meinkewitz are dropped with a rogue sergeant into Cuba, in the midst of the Bay of Pigs operation. Cahill confronts Carlos, the architect of the future nuclear holocaust. He must kill the Carlos and change time forever.