In Afghanistan, during the United States’ longest war, special operators like the Green Berets shouldered a disproportionate share of the fighting. At home, they were held up as heroes for their highly publicized exploits. But behind the glory, there was a dark side the public did not see: a culture of rule-breaking that led to war crimes and, eventually, a vigilante ethos openly embraced by leaders at home.

This troubling history has been shrouded by the Army’s intense secrecy around its operators. In the past four years, I interviewed two dozen current and former members of Army Special Operations, including some who were willing to publicly accuse the organization of misconduct. The Times filed lawsuits that yielded thousands of pages of previously unpublished investigations, detainee files and other military records. To track down and interview scores of local witnesses, I made multiple trips to Afghanistan, where I have been reporting since 2008.

A spokeswoman for Army Special Operations, Lt. Col. Allie Scott, defended the organization. “We have fully investigated and adjudicated the cases you cover,” she wrote. “We are confident our actions stand up to the strictest scrutiny.”

Until now, it hasn’t been possible to reckon with many of these events because they were kept secret. Doing so helps us to understand not only the toll of the war on the U.S’s elite forces but also our current political moment, as the Trump administration loosens restraints on the military, orders lethal military strikes on alleged Venezuelan “narco-terrorists” in the Caribbean and deploys troops to American cities.

Here are five takeaways from the four-part magazine investigation.

The Special Forces’ culture of rule-breaking emerged from the pressures of an unconventional war.

Deployed on isolated firebases in violent enemy territory in Afghanistan, some Green Berets developed practices that skirted or even broke Army regulations, ones that were often tolerated by commanders for the sake of the mission. But rule-breaking could escalate into more serious crimes. The operators I spoke to told me they had employed Afghan guards and translators for offensive firepower and used local forces to hold detainees. Some soldiers carried “drop guns” that they could plant on bodies.