It is formed by the Spanish–Italian Landing Force (SILF) of the Spanish–Italian Amphibious Force (SIAF Spanish: Fuerza Anfibia Hispano-Italiana; Italian: Forza Anfibia Italo-Spagnola).

It consists of 1500 Marines with manpower contributed from the participating countries.

From January until June 2009, it was on the EU Battlegroup standby roster.

[1] The unit uses a modular organization.

The primary core of the unit is made up by: It also has attached units from the Italian and Spanish Navies: