Bahrain

the BDF (established 1968) is responsible for territorial defense and support to internal security; its primary concern is Iran, both the conventional military threat and Tehran's support to regional terrorist groups; the BDF participates in multinational exercises and has conducted small deployments outside of the country; in 2015, for example, Bahrain joined the Saudi Arabia-led military intervention in Yemen, supplying a few hundred troops and combat aircraft Bahrain’s closest security partners are Saudi Arabia and the US; Bahraini leaders have said that the security ties of Bahrain and Saudi Arabia are “indivisible”; Saudi Arabia sent forces to Bahrain to assist with internal security following the 2011 uprising; Bahrain hosts the US Naval Forces Central Command (USNAVCENT; established 1983), which includes the US 5th Fleet and the Combined Maritime Forces (established 2002), a coalition of more than 30 nations providing maritime security for regional shipping lanes; Bahrain also has close security ties with the UK, which maintains a naval support facility there Bahrain hosts the Gulf Cooperation Council's (GCC) Unified Maritime Operations Center and 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 (2025)

Bahrain Defense Force (BDF): Royal Bahraini Army (includes the Royal Guard), Royal Bahraini Navy, Royal Bahraini Air Force Ministry of Interior: National Guard, Special Security Forces Command (SSFC), Coast Guard (2025)

note 1: the Royal Guard is officially under the command of the Army, but exercises considerable autonomy 

note 2: the Ministry of Interior is responsible for internal security and oversees police and specialized security units responsible for maintaining internal order; the National Guard's primary mission is to guard critical infrastructure such as the airport and oil fields and is a back-up to the police; the Guard is under the Ministry of Interior but reports directly to the king

18 years of age for voluntary military service; 18-55 to voluntarily join the reserves (2025)

the military's inventory is comprised of mostly older US armaments alongside smaller quantities from other countries, such as France, Germany, Turkey, and the UK (2025)

information varies; approximately 10,000 active Bahrain Defense Force; approximately 3,000 National Guard (2025)