the EU's Common Security and Defense Policy (CSDP) provides the civilian, military, and political structures for EU crisis management and security issues; the highest bodies are:

the Political and Security Committee (PSC), which meets at the ambassadorial level as a preparatory body for the Council of the EU; it assists with defining policies and preparing a crisis response

the European Union Military Committee (EUMC) is the EU's highest military body; it is composed of the chiefs of defense (CHODs) of the Member States, who are regularly represented by their permanent Military Representatives; the EUMC provides the PSC with advice and recommendations on all military matters within the EU

the Committee for Civilian Aspects of Crisis Management (CIVCOM) provides advice and recommendations to the PSC in parallel with the EUMC on civilian aspects of crisis management

the Politico-Military Group (PMG) provides advice and recommendations to the PSC on political aspects of EU military and civil-military issues, including concepts, capabilities and operations and missions, and monitors implementation

other bodies set up under the CSDP include; the Security and Defense Policy Directorate (SECDEFPOL), the Integrated approach for Security and Peace Directorate (ISP), the EU Military Staff (EUMS), the Civilian Planning and Conduct Capability (CPCC), the Military  Planning  and  Conduct  Capability (MPCC), the European Defense Agency, the European Security and Defense College (ESDC), the EU Institute for Security Studies, and the EU Satellite Center

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 "Elit-e" 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