Outgoing Commander of U.S. Forces in Iraq General Raymond Odierno (2nd L) speaks with Commander of U.S. Central Command General James Mattis (L), U.S. Defense Defense Robert Gates (R) and Chairman of the Joint Chiefs of Staff Admiral Mike Mullen (2nd R) during a meeting in Baghdad on September 1, 2010. | (Photo: Reuters/Jim Watson/Pool)
5. "Be polite, be professional, but have a plan to kill everybody you meet... There is only one 'retirement plan' for terrorists."
Mattis said this to his Marines in Iraq, urging them to stay vigilant, according to Arms Forces Journal.
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