World War I was a major military conflict on Earth, centered in Europe, that began in the summer of 1914 and ended in 1918. The war is also known as the First World War, the Great War, the World War (prior to the outbreak of World War II), and the War to End All Wars. Dr. Rodney McKay likened the Hoffan facility to that of Area 51, to which Major John Sheppard replied "Circa 1918". (SGA: "Poisoning the Well")

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