31.   Could this be the Big One, an actual attack on the United States, the start of the apocalyptic nuclear exchange the world feared throughout the Cold War?

32.   However, the specter of humanity incinerated in a massive nuclear exchange now seems a distant memory.

33.   Khan dismissed speculation that a new war between India and Pakistan would escalate into a nuclear exchange.

34.   Many analysts believe a confrontation could escalate into a nuclear exchange.

35.   The international community fears a fourth conflagration could escalate to a nuclear exchange.

36.   The international community is fearful a fourth conflagration could escalate to a nuclear exchange.

37.   The South Asian rivals have fought three wars in the past half-century, and many fear a future confrontation could quickly escalate into a nuclear exchange.

38.   The principal threats facing the United States are not the fear of a strategic nuclear exchange with the Soviet Union.

39.   The two leaders are chummy and the world has stopped worrying about a U.S.-Soviet nuclear exchange.

40.   Thousands of American troops are operating in the area and, if war turned into a nuclear exchange, they theoretically could be in grave danger.