ARMED FORCES: The Atomic Pinpoint

In Exercise Long Horn, the vast Army-Air Force mock war in Texas, the green-clad Aggressor forces had just seized a position deep behind the defenders' lines and were massing for a new attack. Suddenly a blank mortar shell exploded over the invaders' heads with a roar and a burst of smoke. The umpires stunned the Aggressors with a terse ruling: 1,600 of their men had just been put out of action; the exploding shell symbolized a devastating hit by a revolutionary new weapon, atomic artillery.

This week the U.S. Army and the Atomic...

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