Whether it's an aircraft carrier or a warship, a United States Navy vessel never sleeps on the open sea thanks to a complex orchestra of people and systems tracking its course.
원문출처 : http://www.cnn.com/2017/06/18/politics/how-do-navy-ships-operate/index.html
원문출처 : http://www.cnn.com/2017/06/18/politics/how-do-navy-ships-operate/index.html