On 15 September 1973, Carl Gustaf became King of Sweden upon the death of his grandfather, Gustaf VI Adolf. On 19 September, he took the required regal assurance (Swedish: Konungaförsäkran) during an extraordinary meeting of the cabinet. Afterwards, he appeared before the parliament, diplomatic corps, court, etc. in the Hall of State at the Royal Palace where he gave a speech. Both the cabinet meeting and ceremony at the Hall were broadcast live on television. Following the ceremonies, he appeared on the balcony to acknowledge gathered crowds. At the cabinet meeting, the King declared that his name would be Carl XVI Gustaf and that his title would be King of Sweden. He adopted, "For Sweden – With the times" as his personal motto (För Sverige – i tiden).
King Carl Gustaf holds the highest ranks in the three branches of the Swedish Armed Forces; this is due to the fact that he was, as stipulated by § 14 of the 1809 Instrument of Government in effect at the time of his accession to the throne in 1973, the Commander-in-Chief (Swedish: Högste Befälhavare; not to be confused with the military professional holding the position of Supreme Commander) and therefore he was promoted ex officio from his earlier ranks of captain (Army & Air Force) and lieutenant (Navy), to general and admiral. Under the provisions of the Instrument of Government of 1974, which became effective on 1 January 1975, the King no longer holds this constitutionally-mandated position, but he kept his ranks à la suite since he no longer has any military command authority, except over His Majesty's Military Staff.
So empowered as head of the House of Bernadotte, King Carl Gustaf since he was enthroned in 1973 has made a number of personal decisions regarding the titles and positions of relatives and family members, including the demotion of a sister, elevation of several commoners to royalty, rebuff of an elderly uncle's wishes and the creation of new Swedish titles and duchies.