"The European Council has confirmed the European Union Naval Force (EU NAVFOR) will move its headquarters following the UK’s decision to leave the EU.
The Operational Headquarters will be transferred from Northwood, London, to Rota in Spain, while the Maritime Security Centre Horn of Africa (MSCHOA) will move to Brest, France, as of 29 March 2019."
30 July 2018
https://www.forces.net/news/eu-naval-force-move-headquarters-due-brexit
PS France has 4 aircraft carriers, Italy has 2, UK has 1 (nearly operational)