Introduction
How is the Military in Saudi Arabia and how does it work to maintain Sucity and fight terrorism? In terms of Military and security forces, we have the the Saudi Arabian Armed Forces (SAAF) are divided into two ministries:

Ministry of Defense: Royal Saudi Land Forces, Royal Saudi Naval Forces (includes marines, special forces, naval aviation), Royal Saudi Air Force, Royal Saudi Air Defense Forces, Royal Saudi Strategic Missiles Force; Ministry of the National Guard: Saudi Arabian National Guard (SANG)

Other security forces include: 

Ministry of Interior: Facilities Security Forces, Public Security Forces (police), General Directorate of Border Guard

State Security Presidency (SSP): General Directorate of Investigation (Mabahith), Special Security Forces, Special Emergency Forces (2025).
In Saudi Arabia, Saudi Arabia's security concerns include border security, cyberattacks, instability in Yemen, international terrorism, maritime security, and regional rivals such as Iran and Turkey

Saudi Arabia has close security ties with the US; the SAAF conducts bilateral exercises with the US military and hosts US forces; the US has participated in a cooperative program to equip and train the SANG since 1973, and much of the equipment for both the regular forces and the SANG has been acquired from the US; Saudi Arabia also has defense relationships with China, France, India, Pakistan, the UK, and fellow Gulf Cooperation Council (GCC) members; it is a member of the Peninsula Shield Forces, a joint military force established by the GCC countries with the aim of maintaining security and stability in the region; the force was established in 1982, and its leadership is based in Saudi Arabia (2025)
Security and military information of Saudi Arabia
Military and security service personnel strengths approximately 250,000 active Saudi Armed Forces, including 125,000 under the Ministry of Defense and 125,000 in the National Guard (2025)
Military equipment inventories and acquisitions the inventory of the Saudi military forces, including the SANG, is comprised of imported modern armaments; major suppliers include Canada, China, France, Spain, the UK, and the US; Saudi Arabia is one of the world's largest importers of arms (2025)
Military service age and obligation voluntary military service for men (17-40) and women (typically 21-40, although maximum age may vary by role); no conscription  (2025).
Military deployments .
Military expenditures
Military Expenditures 2024 7.1% of GDP (2024 est.)
Military Expenditures 2023 7% of GDP (2023 est.)
Military Expenditures 2022 6.5% of GDP (2022 est.)
Military Expenditures 2021 7% of GDP (2021 est.)
Military Expenditures 2020 8% of GDP (2020 est.)
Terrorism
In Saudi Arabia, the different Terrorist group(s) inlcude: Islamic State of Iraq and ash-Sham (ISIS); al-Qa’ida
All Important Facts about Saudi Arabia

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Saudi Arabia is found in Western Asia