The U.S. Armed Forces has used the Social Security number as an identification number for the Army and Air Force since July 1, 1969, the Navy and Marine Corps since January 1, 1972, and the Coast Guard since October 1, 1974. Previously, the United States military used a much more complicated system of service numbers.
| Share | Cite. Cameroon (kÄmËÉrÅnË) [ key ], Fr. Cameroun, officially Republic of Cameroon, republic (2005 est. pop. 16,380,000), 183,568 sq mi (475,442 sq km), W central Africa.
Banaue Rice Terraces. The Banaue Rice Terraces are a National Cultural Treasure of the Philippines and are considered to be the 8th Natural Wonder of the World by many Filipinos. The terraces are carved in the mountains of Ifugao and were most likely done by hand.