“The soldier above all others prays for peace,” the former American military general Douglas MacArthur once said, “for it is the soldier who must suffer and bear the deepest wounds and scars of war.” But what about peace with oneself?

More than 120,000 U.S. veterans have died by suicide since record keeping began in 2001, according to Veterans Affairs department data. Many more, in the U.S. and elsewhere, suffer from post-traumatic stress disorder (PTSD) as conflicts spiral around the world. Ukraine’s health ministry estimates that 3 to 4 million people in the country live with PTSD.

Amid this mental health catastrophe, authorities have begun turning to psychedelics for help—and for good reason.

On Feb. 21, Ukraine’s special parliamentary commission responsible for the medical care of veterans and service personnel, voted to establish a working group to assess the effectiveness of MDMA-assisted therapy on PTSD. “We have to deal with mental health issues,” Minister of Healthcare Viktor Liashko, who still needs to sign off on the group, told Ukraine’s official parliament TV channel, “[and examine] how new methods will help quickly and qualitatively.” In December, the U.S. Congress voted to study the effects of psychedelic therapy on soldiers suffering from PTSD and traumatic brain injury. In Israel, a study that would treat Oct. 7 survivors with PTSD, including soldiers, with MDMA could get........

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