The Pentagon's current climate of fear is suppressing the kind of professional dissent that has historically strengthened the U.S. military, argues a retired Army colonel in a stark warning about the institution's future effectiveness.

Gian Gentile, a former director of the military history program at West Point, says that the Defense Department's recent actions—including removing qualified officers from promotion lists and firing senior leaders for not aligning with ideological aims—are creating an environment where service members are afraid to speak up. This is especially dangerous now, as the U.S. is engaged in a conflict with Iran that is entering its seventh month.

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Gentile, who was a prominent critic of U.S. counterinsurgency doctrine and strategy in Iraq and Afghanistan from 2007 to 2013, recalls that his own dissenting views were tolerated by military leadership, even when they were sharply critical. He wrote commentaries and gave lectures questioning the Army's approach, and in 2012 he gave the U.S. strategy in Afghanistan an "F" grade. Yet he was never told to stop.

That tolerance, he argues, is gone. In today's Pentagon, officers are being polygraphed for alleged leaks, and dissent is met with vague punishment. A serving officer who published an essay questioning the Iran operations would likely face severe consequences, he says.

Gentile is careful to distinguish between professional dissent—criticizing operational strategy—and outright disobedience, like Gen. Douglas MacArthur's public challenge to President Truman's policy during the Korean War. MacArthur's relief was justified, Gentile notes.

He also points to the example of Warrant Officer Hugh Thompson Jr., who reported the My Lai massacre in 1968, leading to a full investigation. That kind of moral courage, he says, must be protected.

The stakes are high. With future conflicts likely, the Pentagon needs the intellectual baseline that comes from allowing service members to voice concerns without fear of reprisal. "It is especially important today and in the future for the Department of Defense to allow service members to express professional military dissent without damaging repercussions," Gentile writes.

His own experience—he was promoted to colonel despite his public criticism—shows that dissent and military effectiveness can coexist. But that model is under threat. The Pentagon's leadership must remember the value of dissent, or risk a military that is less effective, less moral, and less ready to face the challenges ahead.