Alfred Coppel’s 1960 Dark December is a standalone post-apocalyptic novel.
Major Kenneth Gavin survived World War Three, protected in the Unimak Island Titan missile base. Over the course of the war, he and his fellow missilemen lobbed salvo after salvo of thermonuclear weapons at the Soviet Union. The United States prevailed; the Soviets have capitulated. Major Gavin is free to go home to his wife Sue and daughter Pam.
If they are still alive and if he can reach them.