The people damaged by helping to conduct America’s drone war speak out in National Bird, a disturbing new documentary produced by Wim Wenders and Errol Morris. Heather, Daniel and Lisa are former operatives in the U.S. Air Force’s predator programme. Having previously conducted America’s unmanned war before turning whistle-blower, all are suffering from various levels of trauma, government surveillance, and the outright threat of jail. Director Sonia Kennebeck’s film tracks their stories as they battle PTSD, legal trouble and, in one case, an eye opening trip to Afghanistan. What emerges is a disturbing portrait of a nation detached from what it means to protect its citizens, or other people’s. And in its drone footage sweeping over the landscapes of America, its warnings for the future are only too clear.