"The KBR contract only covers a single base year, but includes options for up to four additional years, meaning it could keep them in Iraq through 2015. The fact that the military is keeping its options open for contractors in Iraq in 2015 is significant, as officials publicly insist all troops will be out by the end of 2011."
-- Jason Ditz, "Troubled KBR Wins $2.8 Billion Army Contract" (Antiwar.com).