Question: Who was once the Commanding General for the United States Forces - Iraq who was also nominated by Barack Obama to lead the U.S. Central Command?

Context paragraphs:
Marshall B. Webb: Marshall Bradley "Brad" Webb (born November 27, 1961) is a United States Air Force lieutenant general who currently serves as the Commander, U.S. Air Force Special Operations Command (AFSOC).  Prior to his current assignment, he served as the Commander, NATO Special Operations Forces HQ.  Previous to that assignment, he served as the Assistant Commanding General of Joint Special Operations Command (JSOC).  As the Assistant Commanding General of JSOC, Webb was involved in the operation to kill Osama bin Laden.  Webb was seated next to President Barack Obama in the White House Situation Room during the mission.  He later served as Director of Plans, Programs, Requirements, and Assessments, U.S. Air Force Special Operations Command (AFSOC).

John R. Allen: John R. Allen (born December 15, 1953) is a retired United States Marine Corps four-star general, and past Deputy Commander of U.S. Central Command, prior to serving as Commander of the International Security Assistance Force and U.S. Forces Afghanistan (USFOR-A).  On September 13, 2014, President Barack Obama appointed General Allen as Special Presidential Envoy for the Global Coalition to Counter ISIL (Islamic State of Iraq and the Levant).  He was replaced in that role by Brett H. McGurk on October 23, 2015.

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.

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.

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.

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.

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.

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.

Dana J.H. Pittard: Dana J.H. Pittard is a retired United States Army officer.  He was Deputy Commanding General of Operations (DCG-O) for ARCENT, the US Central Command / Third Army, based in Kuwait, until 2015.  Pittard was appointed Joint Force Land Component Commander-Iraq, in response to the June 2014 incursions into Iraq from Syria by the Islamic State in Iraq and the Levant (Daesh), in the days post June 9, 2014.  Pittard was the Commanding General of 1st Armored Division and Fort Bliss in El Paso, Texas.  He was also Deputy Chief of Staff of Operations & Training at the Training and Doctrine Command (TRADOC) at Fort Monroe, Virginia and commanding general of the National Training Center, Fort Irwin, California.

Martin Dempsey: Martin Edward Dempsey (born March 14, 1952), sometimes known as Marty Dempsey, is a retired United States Army general who served as the 18th Chairman of the Joint Chiefs of Staff from October 1, 2011 until September 25, 2015.  He previously served as the 37th Chief of Staff of the Army from April 11, 2011, to September 7, 2011.  Prior to that, he served as Commanding General, U.S. Army Training and Doctrine Command, from December 8, 2008, to April 11, 2011, as Acting Commander, U.S. Central Command, from March 24, 2008, to October 30, 2008, as Deputy Commander, U.S. Central Command, from August 2007 to March 23, 2008, and as Commanding General, Multi-National Security Transition Command – Iraq (MNSTC-I), from August 2005 to August 2007.  Dempsey assumed his assignment as Chairman of the Joint Chiefs of Staff on October 1, 2011 and stepped down from the Chairmanship on September 25, 2015.  He now serves as a professor at Duke University.

Supporting paragraphs: United States Forces – Iraq Lloyd Austin
Answer: General Lloyd Austin served as Commanding General