In Marshall Islands, defense is the responsibility of the US; in 1982, the Marshall Islands signed a Compact of Free Association (COFA) with the US, which granted the Marshall Islands financial assistance and access to many US domestic programs in exchange for exclusive US military access and defense responsibilities; the COFA entered into force in 1986; the Marshall Islands hosts a US Army missile test site 

the Marshall Islands has a "shiprider" agreement with the US, which allows local maritime law enforcement officers to embark on US Coast Guard (USCG) and US Navy (USN) vessels, including to board and search vessels suspected of violating laws or regulations within its designated exclusive economic zone (EEZ) or on the high seas; "shiprider" agreements also enable USCG personnel and USN vessels with embarked USCG law enforcement personnel to work with host nations to protect critical regional resources (2025)