Resolute Support Mission (RSM) or Operation Resolute Support was a NATO-led multinational mission in Afghanistan.[7][8] It began on 1 January 2015 as the successor to the International Security Assistance Force (ISAF), which was completed on 28 December 2014.[9][10] Pursuant to United Nations Security Council Resolution 2189 of 2014,[11] RSM was a noncombat mission aimed at advising and training Afghan security forces to provide long-term security to the country, under the aegis of the Security and Defence Cooperation AgreementBSA between the United States and Afghanistan,[11][12] which was originally supposed to run from 1 January 2015 and "shall remain in force until the end of 2024 and beyond" unless terminated with two years' advance notice.[13][14]
The number of troops and contributing nations would fluctuate throughout RSM's period of activity.[15] In October 2019, RSM had its largest size of troops, which was 17,178.[16][17] Moreover, throughout 2015, the RSM had its peak of contributing nations, which was 42.[17] The US accounted for the largest contingent, while Italy, Germany, and Turkey served leading roles.[18] Intended to play a temporary and transitionary role, the mission gradually withdrew its forces, which numbered around 10,000 at the start of 2021. On 14 April 2021 via a North Atlantic Council Ministerial Statement, NATO announced a drawdown of RSM troops by 1 May,[19] and the mission was terminated early September 2021.[20] The last remaining RSM troops to leave was a U.S. military unit commanded by Major General Christopher T. Donahue, which were withdrawn on August 30, 2021.[21][22]
The objective of the mission was to provide training, advice and assistance for Afghan security forces and institutions in their conflict with extremist groups such as the Taliban, the Haqqani network, and ISIS-K.[23][24][25]
The Resolute Support Mission consisted of approximately 17,000 personnel from NATO and partner nations in Afghanistan. The leader of the operation was at all times identical with the commander of United States Forces - Afghanistan.
The 203rd Corps located in the south-eastern part of the country saw advisers from time to time from TAAC East (one source described this as "fly to advise").[27] The 215th Corps in the south-west is supported by TAAC South.
U.S. President Barack Obama, in an update given from the White House on 6 July 2016, stated that, following General John W. Nicholson's, Joint Chiefs of Staff Chairman General Joseph Dunford's, and U.S. Defense Department Secretary Ashton Carter's mutual recommendations, the U.S. would have about 8,400 troops remaining in Afghanistan through the end of his administration in December 2016.[23]
The residual force of 9,800 troops was withdrawn on 31 December 2016, leaving 8,400 troops stationed at four garrisons (Kabul, Kandahar, Bagram, and Jalalabad).
The Special Inspector General for Afghanistan Reconstruction (SIGAR) was appointed by the US Congress to oversee the $117.26 billion that Congress had provided to implement reconstruction programs in Afghanistan. The SIGAR's "April 30, 2018 Quarterly Report to Congress" says, "[As of January 31, 2018,] 14.5% of the country's total districts [were] under insurgent control or influence [& an additional 29.2% were] contested[.]"[28]
Intended to play a temporary and transitionary role, the mission gradually withdrew its forces, which numbered around 10,000 at the start of 2021. On 14 April 2021 via a North Atlantic Council Ministerial Statement, NATO announced a drawdown of RSM troops by 1 May,[19] and the mission was terminated early September 2021.[20]
In November 2021 NATO published a factsheet on its 'Afghanistan Lessons Learned Process'. Seven meetings of a committee of NATO civil servants were held and the result was termed a "comprehensive review". John Manza, the committee's chair and the contemporary Assistant Secretary General for Operations, presented a summary that was reviewed and discussed by the NAC Permanent Representatives and the NAC Foreign Ministers. NATO HQ felt it "should consider mechanisms to improve the timeliness and relevance of reporting from the field and for more interactive discussions in the Council."[29][30]
SIGAR reported to Congress with the title "Collapse of the Afghan National Defense and Security Forces: An Assessment of the Factors That Led to Its Demise" in May 2022.[31][32]
In 2019, the forces that contributed to the mission were 8,475 Americans that trained and helped Afghan forces, approximately 5,500 Americans engaged in counter-terrorism missions, 8,673 allied soldiers and 27,000 military contractors.[36]
The United Kingdom announced in July 2018 that it sent 440 more British personnel to Afghanistan. Around half of the additional personnel were deployed in August 2018 and the other half followed by February 2019. This increased the total number of British personnel in the country from 650 to 1,090 by early 2019.[38]
The countries that had personnel in Afghanistan as of February 2021 (with complete statistics last published prior to withdrawal) are as follows. The mission was terminated on 12 July 2021, and several countries had personnel in place, before all were withdrawn before 31 August 2021.[7]
The USFOR-A Commander reports to the Commander, United States Central Command (CENTCOM), who reports directly to the Secretary of Defense. This reporting relationship is prescribed in 10 USC Section 164(d)(1). The Resolute Support Mission Commander (COMRS) does not have a direct reporting relationship with the Secretary of Defense. Rather, he reports through the Commander, U.S. CENTCOM. COMRS reports to the NATO chain of command through the Commander of Joint Forces Command – Brunssum, who reports to the NATO Supreme Allied Commander Europe (SACEUR).[78]