Olav Njølstad says that the "stay-behind cooperation with the US and Great Britain represented a milestone in the Norwegian intelligence services' history".

The Olaf rose is a national symbol of Norway and sub rosa is a Latin term referring to confidentiality and secrecy.

On 12 August 2013 the first ever unannounced inspection by Parliament's Intelligence Oversight Committee, was performed at the NIS headquarter at Lutvann in Oslo.

The Norwegian Military Geographic Service, Forsvarets militærgeografiske tjeneste is a subordinate unit to the head of the NIS.

E 14 (Norway) (Seksjon for spesiell innhenting) is/was a highly classified section within the Intelligence Service, focusing on covert missions abroad.