For the past four years, I have been delivering a series of lectures on the virtues of Stoicism to midshipmen at the U.S. Naval Academy in Annapolis, Md., and I was supposed to continue this on April 14 to the entire sophomore class on the theme of wisdom.

Roughly an hour before my talk was to begin, I received a call: Would I refrain from any mention in my remarks of the recent removal of 381 supposedly controversial books from the Nimitz library on campus? My slides had been sent up the chain of command at the school, which was now, as it was explained to me, extremely worried about reprisals if my talk appeared to flout Executive Order 14151 (“Ending Radical and Wasteful Government D.E.I. Programs and Preferencing.”)

When I declined, my lecture — as well as a planned speech before the Navy football team, with whom my books on Stoicism are popular was canceled. (The academy “made a schedule change that aligns with its mission of preparing midshipmen for careers of service,” a Navy spokesperson told Times Opinion. “The Naval Academy is an apolitical institution.”)

In the fall of 1961, a young naval officer named James Stockdale, a graduate of the Naval Academy and future Medal of Honor recipient who went on to be a vice admiral, began a course at Stanford he had eagerly anticipated on Marxist theory. “We read no criticisms of Marxism,” he recounted later, “only primary sources. All year we read the works of Marx and Lenin.”

It might seem unusual that the Navy would send Stockdale, then a 36-year-old fighter pilot, to get a master’s degree in the social sciences, but he knew why he was there. Writing home to his parents that year, he reminded them of a lesson they had instilled in him, “You really can’t do well competing against something you don’t understand as well as something you can.”

At the time, Marxism was not just an abstract academic subject, but the ideological foundation of America’s greatest geopolitical enemy. The stakes were high. The Soviets were pushing a vision of global Communism and the conflict in Vietnam was flashing hot, the North Vietnamese fueled by a ruthless mix of dogma and revolutionary zeal. “Marxism” was, like today, also a culture war boogeyman used by politicians and demagogues.

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