Documents obtained by NewsNation suggest a suicide bombing at the Kabul, Afghanistan, airport two years ago that killed 13 U.S. service members may have been preventable. Gold Star father Darin Hoover, whose son Staff Sgt. Darin Taylor Hoover was killed in the attack, says it's "infuriating" to learn there may have been opportunities to take out the terrorist cell that carried out the bombing. #AbbeyGate #Afghanistan #military More #VargasReports: newsnationnow.com/joinus Anchor Elizabeth Vargas delivers the biggest stories, without bias or opinion. Watch "Elizabeth Vargas Reports" every weeknight at 6p/5C on NewsNation. #VargasReports NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij