"The US Navy – Fact File". United States Navy Fact File. Department of the Navy. February 5, 2009. Archived from the original on October 17, 2013. Retrieved June 4, 2009.
"The US Navy – Fact File". United States Navy Fact File. Department of the Navy. February 5, 2009. Archived from the original on October 17, 2013. Retrieved June 4, 2009.