http://forsvaret.no/om-forsvaret/fakta- ... melser.pdf (.pdf warning)
On page 25 of that PDF, you can find an overview of the Royal Norwegian Navy's current crests. As you can see, HNoMS ULA already have the crest with the motive you wish to use.
Fun fact: The use of the Norwegian Royal Lion for her crest was granted by HM King Haakon VII in 1943 after the CO of ULA requested permission to use the lion following the loss of HNoMS UREDD, in order to show the Germans that the Norwegian lion was still fighting. Given the outstanding record ULA held, the King granted them this unheard of honour. To this day, any Norwegian submarine bearing the honourable name ULA retains that honour.