Etna-class

The Etna class comprises two replenishment and logistic support ships, one serving with the Italian Navy and one with the Hellenic Navy. The two ships share a common hull form but differ in armament and sensor fit. Fincantieri received the contract for the lead ship, Etna, in July 1995; she was launched on 12 July 1997, delivered in February 1998 and commissioned on 29 July 1998. The Greek ship, HS Prometheus, was laid down at Elefsis Shipyards in Elefsina on 18 February 2000, launched on 19 February 2002 and commissioned on 8 July 2003.

The Italian Navy designates Etna a command and logistics ship. Propulsion consists of two Sulzer 12V-ZAV-405 diesel engines driving two shafts and producing 17,290 kW. Cargo capacity comprises 5,795 tonnes of fuel oil, 1,585 tonnes of aviation fuel, 30 tonnes of lubricating oil and 160 tonnes of fresh water, together with 2,100 cubic metres of space for ammunition and other stores. Four replenishment-at-sea rigs are fitted, two of them able to transfer solid stores and one aft restricted to refuelling. Two 50-tonne cranes are carried.

Etna is equipped with NATO Role 2+ hospital facilities, a helicopter workshop, a machine shop for hull, engine and equipment repairs, and an electro-mechanical workshop. The flight deck measures 28 by 21 metres and can handle one light, medium or heavy helicopter, while the hangar accommodates a single AB-212, SH-3D, NH-90 or EH-101. As a command ship, Etna carries two staff rooms and an operations room. Armament is limited to two 25 mm/90 machine guns; the ship is fitted for but not with an OTO Melara close-in weapon system, a Selex fire control system and electronic support measures. A Selex RASS surface search radar is carried.

HS Prometheus differs mainly in armament and equipment. The Hellenic Navy ship mounts eight Rheinmetall 20 mm guns alongside smaller portable weapons, operates and stores a single S-70B-6 Aegean Hawk helicopter, and carries an AN/SPS-10D surface search radar.

Etna's role is to support the long-range deployment of a naval squadron built around an aircraft carrier and its escorts, refuelling the group including the carrier air wing and providing repair workshops, spare parts, ammunition and supplies. Autonomous capacity for electrical power, fresh water and prepared meals, combined with the onboard medical facilities, also allows the ship to be used in civil protection tasks. Etna has taken part in national and multinational exercises on a regular basis. The ship deployed to the Arabian Sea and Persian Gulf as part of the Italian contribution to Operation Enduring Freedom in 1999–2000 and again in 2006. In 2004 Etna operated in the western Mediterranean under Operation Active Endeavour. In 2009–2010 the ship served in the Arabian Sea and Indian Ocean with Operation Atalanta, the multinational counter-piracy effort off the coast of Somalia.