In February 2006, the Spanish Navy was joined by the last fourth anti-aircraft frigate of the Álvaro de Bazán class. These in many ways original units represent the first European vessels and at the same time the first frigate-sized vessels equipped with the American Aegis system.
Gotland class submarines represent the last article in the evolution of Swedish post-war submarines. At the same time, these are the first Western series submarines, designed from the beginning to install an AIP drive. Its resulting concept, using the Stirling engine, is the result of decades of development.
The qualities of the Gotland class submarines were fully confirmed during the two-year internship of the first class unit in the USA. In a series of naval exercises, it became a threat to US Navy vessels and submarines. Work is currently underway on an extensive modernization of the classroom to keep it up to date.