More 1 AM Jade Helm 15 Pre-Training: “YOU MAY HEAR HELICOPTERS, GUNFIRE, & EXPLOSIONS. PLEASE DO NOT BE ALARMED.”
http://www.dcclothesline.com/2015/06/10/more-1-am-jade-helm-pre-training-you-may-hear-helicopters-gunfire-explosions-please-do-not-be-alarmed/