Israeli Sigint National Unit (ISNU)

communications intelligence (COMINT) (a subset of SIGINT)

mobile SIGINT/EW system

signals intelligence (SIGINT)

SIGINT drone

battery coolant unit / battery-coolant unit (BCU)

gear reduction unit / gear-reduction unit

position and navigation unit / position navigation unit (PNU)

pinch (a unit) out of a large unit

air national guard

Allied national authorities

Army National Guard (ARNG)

Assistant to the President for National Security Affairs

Council of National Security and Defense of Ukraine (CNSDU)

Defense National Stockpile

Inactive National Guard (ING)

intra-national terrorism

NASAMS (Norwegian / National Advanced Surface to Air Missile System)

National Aeronautics and Space Administration (NASA)

national air space

national armed establishment

national boundary

National C3 Representatives (NC3REPS, NATO)

National Codification Bureau (NCB)

National Command Authorities (NCA)

national contingent

national contingent commander (NCC)

national contributions

national defense

national defense capability

National Defense College

National Defense University (NDU)

National Emergencies Act