If no one "volunteered," all would be killed, and there were only a few seconds to decide who would be the hero.
Anatol Rapoport (1988), quoted in: William Poundstone (2011) Prisoner's Dilemma. p. 203
1970s and later
“In the US. Infantry Manual published during World War II, the soldier was told what to do if a live grenade fell into the trench where he and others were sitting: to wrap himself around the grenade so as to at least save the others. (If no one "volunteered," all would be killed, and there were only a few seconds to decide who would be the hero.)”
Anatol Rapoport (1988), quoted in: William Poundstone (2011) Prisoner's Dilemma. p. 203
1970s and later
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Anatol Rapoport 45
Russian-born American mathematical psychologist 1911–2007Related quotes

Source: 1870s, Around the World with General Grant (1879), pp. 162–163

Account of 8 October 1918.
Diary of Alvin York
Book I, Chapter 3, p. 75
The Origin of Consciousness in the Breakdown of the Bicameral Mind (1976)

“One looks like a grenade went off in there. The other looks like a bad knife cut.”
Comparing gunshot wounds from AR-15 style rifles and handguns ([Sarah, Zhang, June 17, 2016, September 24, 2018, What an AR-15 can do to the Human Body, Wired, https://www.wired.com/2016/06/ar-15-can-human-body/]; [America’s Failure to Protect Its Children from School Shootings Is a National Disgrace, John, Cassidy, February 15, 2018, September 24, 2018, The New Yorker, https://www.newyorker.com/news/our-columnists/americas-failure-to-protect-its-children-from-school-shootings-is-a-national-disgrace-parkland-florida]; [The one number that shows America’s problem with school shootings is unique, Amanda, Erickson, February 15, 2018, September 24, 2018, The Washington Post, https://www.washingtonpost.com/news/worldviews/wp/2018/02/15/the-one-number-that-shows-americas-problem-with-school-shootings-is-unique/]).
“Why did he get himself killed for us?" "Because he was a hero. And that is what heroes do.”
Source: Drenai series, The King Beyond the Gate, Ch. 20
Context: "We irritated him, he told me. Why did he get himself killed for us?" "Because he was a hero. And that is what heroes do. You understand?"

Living Authors, H. W. Wilson (1932)

Acceptance speech for the 1970 National Medal for Literature, New York, New York (2 December 1970)
Context: If, in the middle of World War II, a general could be writing a poem, then maybe I was not so irrelevant after all. Maybe the general was doing more for victory by writing a poem than he would be by commanding an army. At least, he might be doing less harm. By applying the same logic to my own condition, I decided that I might be relevant in what I called a negative way. I have clung to this concept ever since — negative relevance. In moments of vain-glory I even entertain the possibility that if my concept were more widely accepted, the world might be a better place to live in. There are a lot of people who would make better citizens if they were content to be just negatively relevant.