 After sea expeditions on the armored cruiser and on the coastal defence ships and , he was commissioned as an officer in the Swedish Navy in 1919 with the rank of "fänrik".He devoted himself to the naval artillery, and served on the coastal defence ships and , the torpedo cruiser HSwMS "Claes Horn" and the destroyer HSwMS "Vidar" and became a sub-lieutenant ("löjtnant") in 1922.He realized early on the necessity of modernizing the artillery fire control in order to take advantage of the tremendous development of firepower and range.