크레딧 출연 조 모턴 Narrator (voice) Ruth Gruber Self - Journalist Charles Hendricks Self - Military Historian Heath Twichell Self - Historian William Griggs Self - Army Engineer Billy Connor Self - Civil Engineer Hayward Oubre Self - Army Engineer John Bollin Self - Army Engineer Henry Geyer Self - Army Engineer Fred Mims Self - Quartermaster Corps Alden Hacker Self - Army Engineer Bob Trail Self - Canadian Resident Alice Summer Self - Canadian Resident Alvin Schexnider Self - Historian Wallace Lytle Self - Army Engineer Bob Batey Self - Army Engineer Chester Russell Self - Army Engineer 스텝 Tracy Heather Strain Production Randall MacLowry Writing Michael Rossi Production Katy Mostoller Production Stephen McCarthy Camera Randall MacLowry Editing Randall MacLowry Production Michael Rossi Editing Tracy Heather Strain Directing John Kusiak Sound