“Article 1, Section 8 of the Constitution is pretty simple,” he told a group of Marines at a base in South Korea. “It says, ‘Raise an army.’ It says absolutely nothing about race, color, creed, sexual orientation.

“You all joined for a reason: to serve,” he continued. “To protect our nation, right?”

“Yes, sergeant major,” Marines replied.

“How dare we, then, exclude a group of people who want to do the same thing you do right now, something that is honorable and noble?” Sgt. Maj. Barrett continued, raising his voice just a notch. “Right?”

Sgt. Maj. Barrett then described conversations with U.K. troops, who saw a similar ban lifted a decade ago, with little disruption. And to drive the point home, he produced a pocket copy of the Constitution.