"Castilla" (L52) is a (LPD), and is the twelfth ship of this name. She is the sister ship to the amphibious warfare vessel . The vessel is primarily used to transport Spanish marines but is also used for humanitarian aid missions. Launched in 1999 and commissioned in 2000, "Castilla" took part in Operation Romeo Sierra as part of the Perejil Island crisis in 2002, has participated in multiple military exercises with NATO and provided humanitarian relief in the Caribbean Sea and Gulf of Mexico.