Kennedy argues that military strength can help prevent war by making the costs of aggression unmistakably high. The logic is one of deterrence: if a state possesses forces that are clearly capable of responding to an attack, potential adversaries may be less willing to take the risk of initiating conflict.

In the context of his inaugural address, the statement reflects Cold War concerns about nuclear weapons and strategic rivalry. Kennedy presents sufficient armament not as an end in itself but as a means of reducing the likelihood that weapons will actually be used. The claim rests on the assumption that credible strength can discourage attack and preserve stability. At the same time, deterrence depends on judgement, communication and restraint, because military competition can also create risks of escalation. The quotation therefore captures a central strategic idea of the period: preparedness was presented as a way to make conflict less likely.