Levine, now a senior RAND Corporation analyst, revisits the book he wrote in 1963 soon after he arrived at RAND, The Arms Debate. In the intervening years, he has moved back and forth from Washington, making policy. As he notes, the nuclear danger between the superpowers has become less as the understanding of the complexities of the public debate has grown. As in his earlier book, Levine lucidly sets out the logic of the various arguments about America's security, with a civility that is as welcome now as it was in 1963.