NATO has to find a successor to Secretary General Jens Stoltenberg, who is set to leave his post to head Norway’s central bank, the Norwegian Finance Ministry announced in Oslo on Friday. “I am grateful for the trust and look forward to the task,” said Stoltenberg at a press conference held by the Norwegian Finance Ministry on Friday. Stoltenberg, who served as Norwegian prime minister from 2005 to 2013, has been NATO secretary general since 2014. His current term is set to expire in September and was not expected to be renewed, as few NATO heads stay in post for more than five years. During h…