WASHINGTON, July 30 (Reuters) - Uzbekistan has told the United States to quit a military base that has served as a hub for missions to Afghanistan since shortly after the September 11, 2001, attacks, a Pentagon spokesman said on Saturday. A notice to leave Karshi-Khanabad air base, also known as K2, was delivered on Friday by a courier from the Uzbek Foreign Ministry to the U.S. Embassy in Tashkent, the Washington Post reported in its Saturday edition, citing an unnamed senior U.S. official involved in Central Asia policy. Asked about the report, Pentagon spokesman Glenn Flood said early on...