the other. But he warns that there are broad gray areas between high energy laser systems designed only to track satellites and the lethal laser weapon systems. This blurring is likely to increase as high energy laser technology ad- vances, producing severe problems for arms control negotiators. On the other hand, Smernoff suggests, perhaps the primary task of long-term arms control should be to seek a smooth transition from the instability of nuclear deterrence based on offensive weapons to reliance...