Keywords: Smoke Signals (12324276623).jpg Japan Maritime Self-Defense Force aviators light night-time smoke signals as part of their mandatory semi-annual Life-Saving Survival Training aboard Marine Corps Air Station Iwakuni Japan Jan 28 2014 Night-time smoke signals use grey smoke with a flashing red light while day-time smoke signals are bright red in color The signals burn for approximately 70 seconds U S Marine Corps photo by Lance Cpl D A Walters/Released https //www flickr com/photos/marine_corps/12324276623/ Smoke Signals 2014-01-28 13 20 https //www flickr com/people/40927340 N03 Marines from Arlington VA United States PD-USGov United States Marine Corps Official Page https //flickr com/photos/40927340 N03/12324276623 2016-09-03 22 12 35 United States Government Work Japan Maritime Self-Defense Force |