Division of the Swedish Armed Forces Central Command
Military Intelligence and Security Service (Swedish: Militära underrättelse- och säkerhetstjänsten, MUST) is a division of the Swedish Armed Forces Central Command. MUST is both a foreign intelligence and a military security/counterintelligence agency. In its intelligence role, MUST is responsible for providing intelligence on foreign threats to the Government of Sweden and the Swedish Armed Forces. However, signals intelligence is handled by a separate civilian agency operated by the Ministry of Defence, the Swedish National Defence Radio Establishment (FRA), which is not part of MUST.
https://en.wikipedia.org/wiki/Swedish_Military_Intelligence_and_Security_Service