Defense Security Service (DSS)

distributed surveillance system (DSS)

security agreement (information security, NATO)

Council of National Security and Defense of Ukraine (CNSDU)

defense and Security Directorate (NATO)

defense and security sector

Defense Security Cooperation Agency (DSCA)

European Security and Defense Identity (ESDI)

European Security and Defense Policy (ESDP)

national security and defense

Royal United Services Institute for defense and Security Studies (RUSI)

security in defense

Central Security Service (CSS)

Federal Security Service of the Russian Federation (FSB)

military security service

security service

Security Service / Military Intelligence, Section 5 (MI5)

Security Service of Ukraine (SSU)

site security service

Danish Security and Intelligence Service

United States Air Force Security Service

MIVD (Militaire Inlichtingen- en Veiligheidsdienst / Dutch Military Intelligence and Security Service)

sea surface drone (unique invention of Security Service of Ukraine - SSU)

airport security service

security courier service

perimeter defense (all-around defense)

beach defense mine / beach-defense mine

US Army Trial Defense Service

Defense Audit Service

secret defense service

branch (military/service branch, armed service)

separate from active service / the service

Y service (Y-service) / Y-station