In a 2010 "Space Foundation" survey, Armstrong was ranked as the most popular space hero; and in 2013, "Flying" magazine ranked him #1 on its list of 51 Heroes of Aviation. The press often asked Armstrong for his views on the future of spaceflight. In 2005, he said that a human mission to Mars would be easier than the lunar challenge of the 1960s. In 2010, he made a rare public criticism of the decision to cancel the Ares I launch vehicle and the Constellation Moon landing program. In an open letter also signed by fellow Apollo veterans Lovell and Cernan, he noted, "For The United States, the leading space faring nation for nearly half a century, to be without carriage to low Earth orbit and with no human exploration capability to go beyond Earth orbit for an indeterminate time into the future, destines our nation to become one of second or even third rate stature". On November 18, 2010, aged 80, he said in a speech during the "Science & Technology Summit" in the Hague, Netherlands, that he would offer his services as commander on a mission to Mars if he were asked.