Question: The Commanding Army General during the United States Forces - Iraq was the 12th commander of what unit?

Context paragraphs:
United States Forces – Iraq: United States Forces – Iraq (USF-I) was an American military sub-unified command, part of U.S. Central Command.  It was stationed in Iraq as agreed with the Government of Iraq under the U.S.–Iraq Status of Forces Agreement.  USF–I replaced the previous commands Multi-National Force – Iraq, Multi-National Corps – Iraq, and Multi-National Security Transition Command – Iraq from January 2010.  General Lloyd Austin served as Commanding General.  The logo of the USF-I depicts a lamassu.

Lloyd Austin: Lloyd James Austin III (born August 8, 1953) is a retired United States Army general.  He was the 12th commander of United States Central Command (CENTCOM).  Austin was the first African American to head the organization.  Prior to his assignment in CENTCOM, Austin served as the 33rd Vice Chief of Staff of the United States Army from January 31, 2012, to March 8, 2013.  His assignments prior to CENTCOM were as the last Commanding General of United States Forces - Iraq, Operation New Dawn, which ended on December 18, 2011, and then Vice Chief of Staff of the United States Army.  On December 6, 2012, the Pentagon announced that President Barack Obama had nominated Austin to lead the U.S. Central Command.  Austin was confirmed by the U.S. Senate on March 5, 2013, and assumed command on March 22, 2013.  On April 5, 2016, Austin's retirement ceremony took place at Joint Base Myer–Henderson Hall.  He received the Defense Distinguished Service Medal, the Army Distinguished Service Medal, the Defense Superior Service Medal, the Legion of Merit, and others.

Vincent K. Brooks: Vincent Keith Brooks (born October 24, 1958) is a United States Army general who is the current commander of United States Forces Korea, United Nations Command and ROK-U.S. Combined Forces Command.  He previously served as commanding general of the United States Army Pacific and before that as the commanding general of Third Army.  Brooks was the United States Army's Deputy Director of Operations during the War in Iraq, and frequently briefed the media, which raised his public profile.  He also served as the Chief of Army Public Affairs The Pentagon.  He later was commanding general of the 1st Infantry Division.  General Brooks assumed his current assignment on April 30, 2016.

Robert W. RisCassi: Robert William RisCassi (born January 18, 1936) is a retired United States Army four-star general who served as Vice Chief of Staff of the United States Army (VCSA) from 1989 to 1990; Commander in Chief, United Nations Command/Commander in Chief, ROK/U. S. Combined Forces Command/Commander, U.S. Forces Korea/Commanding General, Eighth United States Army (CINCUNC/CINCCFC/COMUSFK/CG EUSA) from 1990 to 1992; and Commander in Chief, United Nations Command/Commander in Chief, ROK/U. S. Combined Forces Command/Commander, United States Forces Korea (CINCUNC/CINCCFC/COMUSFK) from 1992 to 1993.

Frank Helmick: Frank Helmick is a retired United States Army Lieutenant General.  He is the former Commanding General of the XVIII Airborne Corps.  From February to December 2011, he additionally served as the Deputy Commanding General for Operations, United States Forces - Iraq.  Prior to assuming command of the XVIII Airborne Corps, LTG Helmick commanded the Multi-National Security Transition Command - Iraq along with the NATO Training Mission-Iraq from July 3, 2008 to October 7, 2009.

Robert W. Cone: Robert William Cone (March 19, 1957 – September 19, 2016) was a United States Army four-star general who last served as the commanding general of U.S. Army Training and Doctrine Command.  He assumed command of TRADOC on 29 April 2011.  He previously served as the commander of Fort Hood and III Corps on 22 September 2009 where he also deployed to Iraq in February 2010, and served as the Deputy Commanding General for Operations, United States Forces – Iraq, until February 2011.  Prior to that, he served as the Special Assistant to the Commanding General of U.S. Army Training and Doctrine Command in Fort Monroe, VA.  He retired in 2014.

Carter B. Magruder: Carter Bowie Magruder (April 3, 1900March 14, 1988) was a United States Army general who served concurrently as Commander in Chief, United Nations Command/Commander, United States Forces Korea/Commanding General, Eighth United States Army (CINCUNC/COMUSFK/CG EUSA) from 1959 to 1961.

William J. Livsey: William James "Lipp" Livsey (June 8, 1931 – June 18, 2016) was a United States Army general who served as the Commander in Chief of United Nations Command/Commander in Chief, ROK/U. S. Combined Forces Command/Commander, United States Forces Korea/Commanding General, Eighth United States Army (CINCUNC/CINCCFC/COMUSFK/CG EUSA), from 1984 to 1987.

Raymond T. Odierno: Raymond Thomas "Ray" Odierno ( ; born 8 September 1954) is a retired United States Army General who served as the 38th Chief of Staff of the Army.  Prior to his service as Chief of Staff, Odierno commanded United States Joint Forces Command from October 2010 until its disestablishment in August 2011.  He served as Commanding General, United States Forces – Iraq and its predecessor, Multi-National Force – Iraq, from September 2008 through September 2010.  Before then, he served as Commanding General, III Corps, from May 2006 to May 2008.  Odierno is the twelfth American military officer to command at the Division, Corps, and Army level during the same conflict and only the second with this distinction since the Vietnam War.  Before commanding III Corps, he served as Assistant to the Chairman of the Joint Chiefs of Staff in Washington, where he was the primary military adviser to Secretary of State Condoleezza Rice from 3 November 2004 to 1 May 2006.

James L. Terry: James L. Terry is a Lieutenant General (Ret) in the United States Army.  He was born in Chatsworth, Georgia on May 14, 1957.  In 1978, he graduated from North Georgia College and through ROTC, commissioned into the Infantry.  Terry has commanded at multiple levels across the Army.  Terry's last assignment was as the commanding general of United States Army Central, retiring 17 November 2015.  Terry served as the last commander of V Corps before its inactivation in 2013.  While commanding V Corps, he concurrently served as Commander, International Security Assistance Force Joint Command (IJC), and as deputy commander of United States Forces Afghanistan.  He was the Commanding General of the 10th Mountain Division (Light Infantry) from 2009 to 2011.

Supporting paragraphs: United States Forces – Iraq Lloyd Austin
Answer: United States Central Command