Question: How many troops does the mission that Train Advise Assist Command - South is a part of advise and assist?

Context paragraphs:
Train Advise Assist Command – Capital: Train Advise Assist Command – Capital (TAAC – Capital) is a multinational military formation, part of NATO's Resolute Support Mission within Afghanistan.  It is the former Regional Command Capital of the International Security Assistance Force (ISAF), the redesignation taking place in August 2014.  The headquarters is in Kabul.  Regional Command Capital was in turn a redesignation of the former Kabul Multinational Brigade, the change taking place on 6 August 2006.  The KMNB usually had about three battlegroups, responsible each for a sector of Kabul.

OSCE Mission to Croatia: OSCE Mission to Croatia was the field mission of the Organization for Security and Co-operation in Europe operating in Croatia in from July 1996 until the December 2007.  The Mission become preeminent international organization in Croatia after the departure of UNTAES forces from the Eastern Slavonia, Baranja and Western Syrmia.  Original Mission's was supposed to last until the 1999 and it consisted of 280 international personnel (including 120 police monitors) and 320 national staff deployed in twenty field offices and three regional coordination centers as well as the Zagreb headquarters.  The first mandate adopted by the Permanent Council in April 1996 authorized the Mission to ""provide assistance and expertise to the Croatian authorities at all levels, as well as to interested individuals, groups and organisations, in the field of the protection of human rights and of the rights of the persons belonging to national minorities.  In this context and in order to promote reconciliation, the rule of law and conformity with the highest internationally recognised standards, the Mission will also assist and advise on the full implementation of legislation and monitor the proper functioning and development of democratic institutions, processes and mechanisms"."  On the 14 July 1997 United Nations Security Council Resolution 1120 urged the Government of the Republic of Croatia to cooperate fully with the OSCE mission in return of all refugees and displaced persons, protection of their rights, and the protection of persons belonging to national minorities.  The annual budget of the Mission in 2000 was 21,086,900 euros.  Along the Zagreb headquarters mission was operating from three co-ordination Centres in Vukovar, Sisak and Knin and 14 field offices.  In the region of former Eastern Slavonia, Baranja and Western Syrmia mission operated the Police Monitoring Group in the 1998-2000 period but close it down in September 2000 due to the stable security situation in Croatia and notably in the Danube region.  On the 21 December 2007 OSCE Permanent Council decided on closing the OSCE Mission to Croatia, on 31 December 2007, and keeping only the OSCE office in Zagreb.  This office itself was closed on 17 January 2012.  Croatia became full member state of NATO in 2009 and European Union in 2013.

Foreign Emergency Support Team: The Foreign Emergency Support Team (FEST) is the U.S. government’s only interagency, on-call, short-notice team poised to respond to terrorist incidents worldwide.  The FEST deploys to assist and advise the U.S. Chief of Mission in assessing crises and coordinating U.S. government crisis response activities.  The FEST includes representatives from the US Department of State, Department of Defense, the Intelligence Community, and the Federal Bureau of Investigation, and other appropriate agencies, such as the Department of Energy, as circumstances warrant.  FEST composition is flexible and tailored to the specific incident and U.S. Embassy needs.  The FEST provides specialized crisis response expertise to augment existing U.S. Mission and host government capabilities.

Viet Xuan Luong: Viet Xuan Luong (Vietnamese: "Lương Xuân Việt") is a United States Army Brigadier General.  He is the first American officer promoted to flag rank who was born in Vietnam.  He is currently the Deputy Commanding General (Operations), Eighth Army.  He previously served as chief of staff of United States Army Central.  His prior assignments included Director of Joint and Integration, Headquarters Department of the Army, G-8; assistant division commander–maneuver for the 1st Cavalry Division at Fort Hood, concurrent with assignment as commander, Train Advise Assist Command – South, Resolute Support Mission Joint Command, North Atlantic Treaty Organization, Afghanistan.

Train Advise Assist Command – South: Train Advise Assist Command – South (TAAC – South) is a multinational military formation, part of NATO's Resolute Support Mission within Afghanistan.  It is the former Regional Command South of the International Security Assistance Force (ISAF).

Resolute Support Mission: Resolute Support Mission or Operation Resolute Support is a NATO-led train, advise and assist mission consisting of over 13,000 troops in the Islamic Republic of Afghanistan, which began on January 1, 2015.  It is a follow-on mission to the International Security Assistance Force (ISAF) which was completed on December 28, 2014. <ref name="NATO 30/01"> </ref> Its current commander is U.S. Army General John W. Nicholson Jr. who replaced U.S. Army General John F. Campbell on 2 March 2016.

Train Advise Assist Command – West: Train Advise Assist Command – West (TAAC – West) is a multinational military formation, part of NATO's Resolute Support Mission within Afghanistan.  It is the former Regional Command West of the International Security Assistance Force (ISAF).

Train Advise Assist Command – East: Train Advise Assist Command – East (TAAC – East) is a multinational military formation, part of NATO's Resolute Support Mission within Afghanistan.  It is the former Regional Command East of the International Security Assistance Force (ISAF).  The United States Army provided the force headquarters.  As of February 2014, the 10th Mountain Division is providing the command headquarters at Bagram Air Field.  In 2012, U.S. Vice President Joe Biden called the region "the most dangerous place in the world."

Train Advise Assist Command – Air: Train Advise Assist Command – Air (TAAC – Air) is a multinational military formation, part of NATO's Resolute Support Mission within Afghanistan.

Train Advise Assist Command – North: Train Advise Assist Command – North (TAAC – North) is a multinational military formation, part of NATO's Resolute Support Mission within Afghanistan.  It is the former Regional Command North of the International Security Assistance Force.

Supporting paragraphs: Train Advise Assist Command – South Resolute Support Mission
Answer: 13,000