National Security Council 
National Simulation Center 
National Safety Council 
Network Services Complex 
National Science Council 
Naval Supply Center 
Network Systems Corporation 
Natick Soldier Center 
Norwegian Space Centre 
NASCAR 
National Science Center 
National Simulations Center 
NATO Supply Center 
Norwegian Space Center 
national screening committee 
National Software Council 
National Space Council 
National Steel Corporation 
National Supplier Clearinghouse 
Nebraska Service Center 
Network Secure Communications 
Network Service Center 
Network Specialized Center 
Network Switching Center 
Node Site Coordinator 
NOISE SUPPRESSION CIRCUIT 
Non-Standard Command 
Non-Standard Facilities Command 
Nuclear Services Corporation 
NACC Software Communications