War is as natural as life and death. Life is war. It is the natural means among all living organisms by which the weaker species is vanquished and the stronger species predominates. Beneath a thin veil of civilization, the unrecognized and undeclared war simmers constantly as people compete for ever-diminishing supplies of fuel and food. Dr. Frank Swaim served for a year as a medic with the United States Air Force in Vietnam; he saw this thin veil...