Question: The first female officer to command a major Unified Combatant Command in the United States Armed Forces succeeded a Navy admiral who served as the 23rd commander of what?

<P0-S0> James Alexander "Sandy" Winnefeld Jr. (born April 24, 1956) is a retired(On Special Mission in Afghanistan). <P0-S1>  United States Navy admiral who served as the ninth Vice Chairman of the Joint Chiefs of Staff from August 4, 2011 to July 31, 2015. <P0-S2>  He previously served as the fourth Commander, U.S. Northern Command (USNORTHCOM) and the 21st Commander, North American Aerospace Defense Command (NORAD) from May 19, 2010 to August 3, 2011. <P0-S3>  Prior to that, Winnefeld served as Director for Strategic Plans and Policy, The Joint Staff which he concurrently served as the Senior Member, U.S. Delegation to the U.N. Military Staff Committee. <P0-S4>  His other operational commands include serving as the Commander, U.S. Sixth Fleet and Commander, Allied Joint Command Lisbon. <P0-S5>  As the Vice Chairman of the Joint Chiefs of Staff, Winnefeld was the second highest-ranking officer in the United States Armed Forces, second only to the Chairman of the Joint Chiefs of Staff. <P0-S6>  In 2015, he retired from the Navy after over 37 years of service. <SEP> <P1-S0> William Evans "Bill" Gortney (born September 25, 1955) is a retired United States Navy admiral who most recently served as the sixth commander of U.S. Northern Command and the 23rd commander of North American Aerospace Defense Command (NORAD). <P1-S1>  He previously served as the Commander, U.S. Fleet Forces Command from September 14, 2012 to December 2014 and Director of the Joint Staff from July 1, 2010 to August 2012. <P1-S2>  Prior to that, he served as Commander, U.S. Naval Forces Central Command/5th Fleet. <P1-S3>  He assumed his post as CDRUSNORTHCOM and commander of NORAD on December 5, 2014, and was succeeded by USAF General Lori Robinson on May 13, 2016. <SEP> <P2-S0> United States Pacific Command (USPACOM) is a unified combatant command of the United States Armed Forces responsible for the Indo-Asia-Pacific region. <P2-S1>  It is the oldest and largest of the unified combatant commands. <P2-S2>  Its commander, the senior U.S. military officer in the Pacific, is responsible for military operations in an area which encompasses more than 100 e6sqmi , or roughly 52 percent of the Earth’s surface, stretching from the waters off the west coast of the United States to the west coast of India, and from the Arctic to the Antarctic. <P2-S3>  The Commander reports to the President of the United States through the Secretary of Defense and is supported by Service component and subordinate unified commands, including U.S. Army Pacific, U.S. Pacific Fleet, U.S. Pacific Air Forces, U.S. Marine Forces Pacific, U.S. Forces Japan, U.S. Forces Korea, Special Operations Command Korea, and Special Operations Command Pacific. <P2-S4>  USPACOM also has three direct reporting units (DRUs), including Daniel K. Inouye Asia-Pacific Center for Security Studies, U.S. Pacific Command Joint Intelligence Operations Center, Center for Excellence in Disaster Management and Humanitarian Assistance; and a Standing Joint Task Force, Joint Interagency Task Force West. <P2-S5>  The USPACOM headquarters building, the Nimitz-MacArthur Pacific Command Center, is located on Camp H.M. Smith, Hawaii. <SEP> <P3-S0> Lori J. Robinson (born 1959) is a United States Air Force general who currently serves as commander of the U.S. Northern Command (USNORTHCOM) and commander of the North American Aerospace Defense Command (NORAD). <P3-S1>  She is the first female officer to command a major Unified Combatant Command in the history of the United States Armed Forces.