SINGAPORE (Sept. 11, 2015) - U.S. Navy Sailors and civilian participants sing the National Anthem during the Navy Region Center Singapore (NRCS) Patriot Day ceremony to honor and remember those who lost their lives during the terroist attacks on Sept. 11, 2001. During the ceremony, leaders spoke about the importance of remaining vigilant and steadfast as everyone's continued mission. (Official U.S. Navy Photo by Marc Ayalin)