April 11, 2018 Updated April 11, 2018 20180411_atc_why_the_number_of_military_aviation_accidents_has_sharply_increased.mp3 Listen • 4:39 20180411_atc_why_the_number_of_military_aviation_accidents_has_sharply_increased.mp3 Copyright 2018 NPR. To see more, visit http://www.npr.org/.