Richard L. Garwin, in Interna-tional security (Fall 1983), The MIT Press Submarines (Journals), 28 Carleton St., Cambridge. Mass. 02142; "The Invisible Force" John Tierney, in Science 83 (Nov. 1983),
P.O. Box 10790, Des Moines, Iowa 50340.
Two legs of the U.S. strategic "triad"-land-based ICBMs and B-52 bombers-are shakier today than they once were. But the 34 U.S. Posei- don and Trident submarines will remain a virtually invulnerable deter- rent for a long time to come.
While...