For hundreds of years, the U.S. military has been killing people. It’s been a constant of our history. Another constant has been American military personnel killing civilians, whether Native Americans, Filipinos, Nicaraguans, Haitians, Japanese, Koreans, Vietnamese, Cambodians, Laotians, Afghans, Iraqis, Syrians, Yemenis, and on and on. And there’s something else that’s gone along with those killings: a lack of accountability for them.