| Abbreviation | Definition |
|---|---|
| NSC/PC | National Security Council/Principals Committee |
| NSC/PCC | National Security Council Policy Coordinating Committee |
| NSCAD | Naval Safety Center Aviation Directorate |
| NSCC | NATO (North Atlantic Treaty Organization) SPECOPS (Special Operations) Coordination Center |
| NSCC | Naval Sea Cadet Corps |
| NSCID | National Security Council Intelligence Directive |
| NSCID | NSC Intelligence Directive |
| NSCS | National Security Council System |
| NSCT | National Strategy for Combating Terrorism |
| NSCTI | Naval Special Clearance Team One |
| NS-CWMD | National Strategy to Combat Weapons of Mass Destruction |
| NSD | National Security Directive |
| NSD | National Security Division (FBI) |
| NSD | Navy Support Date |
| NSD | Network Service Definition |
| NSD | Never Say Die |
| NSDA | Non-Self Deployment Aircraft |
| NSDAB | Non-Self-Deployable Aircraft and Boats |
| NSDD | National Security Decision Directive |
| NSDM | National Security Decision Memorandum |