Military branches:
as of 2020-2021, military and security forces operating in Yemen consists of a patchwork of government, non-state, and foreign-backed regular, semi-regular/militia, and paramilitary forces, often with informal command organizations and conflicting, fluid, or overlapping agendas, loyalties, and relationships; in addition, the Huthis maintain opposition military and security forces
Republic of Yemen Government (ROYG) forces; Ministry of Defense: Yemeni National Army, Air Force and Air Defense, Navy and Coastal Defense Forces, Border Guard, Strategic Reserve Forces (includes Special Forces and Presidential Protection Brigades, which are under the Ministry of Defense but responsible to the president), Popular Committee Forces (government-backed tribal militia); Ministry of Interior: Special Security Forces (paramilitary; formerly known as Central Security Forces), Political Security Organization (state security), National Security Bureau (intelligence), Counterterrorism Unit
Saudi-backed forces: paramilitary/militia border security brigades based largely on tribal or regional affiliation (deployed along the Saudi-Yemen border, especially the areas bordering the governorates of Saada and Al-Jawf)
United Arab Emirates-backed forces include tribal and regionally-based militia and paramilitary forces (concentrated in the southern governates): Southern Transitional Council (STC) forces, including the Security Belt Forces, the Shabwani and Hadrami “Elite” Forces, the Support and Backup Forces (aka Logistics and Support Forces), Facilities Protection Forces, and Anti-Terrorism Forces; Republican Forces; Joint Forces; note – under the 2019 Riyadh Agreement, the STC forces are to be incorporated into Yemen’s Ministries of Defense and Interior under the authority of the HADI government
Huthi: ground, air/air defense, coastal defense, presidential protection, special operations, missile, and tribal militia forces
note – a considerable portion--up to 70 percent by some estimates--of Yemen’s military and security forces defected in whole or in part to former president SALAH and the Huthi opposition in 2011-2015
Definition: This entry lists the military and security forces subordinate to defense ministries or the equivalent (typically ground, naval, air, and marine forces), as well as those belonging to interior ministries or the equivalent (typically gendarmeries, border/coast guards, paramilitary police, and other internal security forces).
Source: CIA World Factbook - This page was last updated on Saturday, September 18, 2021