WASHINGTON, DC - FEBRUARY 22: Former Secretary of Defense Donald Rumsfeld signs copies of his new memoir, "Known and Unknown," at The Heritage Foundation February 22, 2011 in Washington, DC. Rumsfeld... more 
WASHINGTON, DC - FEBRUARY 22: Former Secretary of Defense Donald Rumsfeld signs copies of his new memoir, "Known and Unknown," at The Heritage Foundation February 22, 2011 in Washington, DC. Rumsfeld said the book took four years to write and talks about his relationships with former colleagues in the administration of George W. Bush. (Photo by Chip Somodevilla/Getty Images) less 
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Getty Images | Photo By Chip Somodevilla / Getty Images
Tue, Feb 22, 2011 1:17 PM EST