This might be peak Social Justice Warrior:

They had come to join Native American tribes and environmentalists protesting an oil pipeline, fully expecting to endure tear gas and rubber bullets. But in the end, veterans who traveled to the Standing Rock Sioux Reservation found something far more profound.

Inside the auditorium at a reservation casino, Wes Clark Jr. and about a dozen veterans in formation behind him faced a small group of Sioux spiritual leaders. Encircling them, hundreds of other veterans looked on.

“We came. We fought you. We took your land. We signed treaties that we broke,” he said.