However, it was found, that "not all of the accepted cadets possessed mind and qualities to become naval officers," why the school in 1761 was converted into a reformatory, common for the maritime and land state.

[4] The school ceased in 1791 after a conflagration and the lustschloss Karlberg in Stockholm opened the following year as a Royal War Academy with the task "to prepare skilled subjects to the national land army and navy."

At the latter location there was a joint advanced course at the mate, skipper and artillery schools, named the Educational Institution for Officers of the Royal Navy in Karlskrona.

When the Royal War Academy in 1862 finally was converted into a military application school "for all the army and the navy needed officers," it led the organization to such disorders, particularly with regard to the entry age, education and training, that the school was considered inappropriate for sea cadet's teaching of serviceable professionals.

[6] Rising number of courses and the greatly increased number of students in each course, a huge increase in mainly military subjects, the categorical requirement of student accommodation in an environment where the short training time could be utilized effectively, lack of own spaces for boat service, gymnastics, athletics and weapons exercises and the need for adequate facilities for teaching operation, were some of the reasons why the old Naval Academy at Skeppsholmen was no longer sufficient.

In a year's time, in 1942, all the required conversion and new construction projects were completed, and on 11 January 1943 the Naval Academy took Näsby in possession.

[9] Designed in 1876 as a compact Renaissance palace by Vice City Architect Axel Fredrik Nyström (1832–1894) and inaugurated in 1879, the sumptuous façades of the three stories, to many, were regarded as indecorous on the military setting on the island.

The reform of the military academy in 1862 had, however, forced the education of naval officers to be relocated to the eastern part of the city, and Nyström's plans were therefore accepted.

The building served as a school until 1943, today being the location for the organisation Nordregio, instigated by the Nordic Council of Ministers in 1997, and advocating issues of interest for northern Europe and the Baltic region.

[12] On 10 February 1976 it was replaced by "Reginamarsch" (Urbach), which the school used together with the 11th Helicopter Squadron (11. helikopterdivisionen) and the East Coast Naval Base.