... The flag on the moon represents an important event in vexillological history. ... During their historic extravehicular activity (EVA), the Apollo 11 crew planted the flag of the United States on the lunar surface. ... Like any activity in space exploration, the Apollo flag-raising also provided NASA engineers with an interesting technical challenge. ... As NASA plans a return to the moon and an expedition to Mars, we will likely see flags continue to go "where no flag has gone before." ...