Chuck Hagel (R-NE), to oppose any further escalation in Iraq; and in voting in March 2007, in favor of setting a withdrawal date for U.S. forces in Iraq. After continued criticism over the Iraq War troop surge, in August 2007, Levin and senator John Warner (R-VA), visited military bases in Mosul and Baghdad, saying that the surge brought "credible and positive results," though it failed to bring the political reconciliation needed and urged the Iraqi Parliament to hold a "no-confidence vote" on the government of Prime Minister al-Maliki. In October 2011, Levin said that President Barack Obama made the "right decision" in withdrawing U.S. troops from Iraq at the end of 2011, and not continuing a U.S. military presence. National Defense Authorization Act 2012 As part of the National Defense Authorization Act for Fiscal Year 2012 (the main annual bill used to fund the US military) Levin and Senator John McCain (ranking Republican on Armed Services Committee-AZ) included provisions that affirmed the authority of the United States military to detain captured individuals, including terrorists, in accordance with the law of war and required such detention for members of al Qaeda and others who planned or carried out the attacks against the United States. As initially proposed the provisions applied to American citizens. After objections were raised that such detention violates Americans' constitutional rights, Levin agreed to include language (to section 1032, later 1021, of the bill) which exempted American citizens from the requirement for military detention. The provision affirming the authority for military detention was modified to specify that it did not affect existing law or authorities relating to the detention of U.S. citizens or lawful resident aliens, but did not specifically exclude them from indefinite detention. Levin quoted the Supreme Court's 2004 decision in Hamdi v. Rumsfeld in support of his language authorizing indefinite detention. National Defense Authorization Act 2015 The 2015 National Defense Authorization Act was named the Carl Levin and Howard P. "Buck" McKeon National Defense Authorization Act for Fiscal Year 2015. Levin-Warner Legislative Affairs Suite In 2016, the Department of Defense named the office suite of the Office of the Assistant Secretary of Defense for Legislative Affairs in honor of Levin and Sen. John Warner to honor their bipartisan legislative accomplishments. Acquisition Levin authored the Competition in Contracting Act, which has led to reductions in federal procurement costs. He played an instrumental role in the enactment