5-inch 54 calibre Mark 45 gun, supplemented by an eight-cell Mark 41 vertical launch system (for RIM-7 Sea Sparrow or RIM-162 Evolved Sea Sparrow missiles), two machine guns, and two Mark 32 triple torpedo tube sets (initially firing Mark 46 torpedoes, but later upgraded to use the MU90 Impact torpedo). They were also designed for but not with a close-in weapons system (two Mini Typhoons fitted when required from 2005 onwards), two quad-canister Harpoon anti-ship missile launchers (which were installed across the RAN vessels from 2005 onwards), and a second Mark 41 launcher (which has not been added). The Australian Anzacs use a Sikorsky S-70B-2 Seahawk helicopter; plans to replace them with Kaman SH-2G Super Seasprites were cancelled in 2008 due to ongoing problems. Perth was laid down at Williamstown, Victoria, on 24 July 2003. The ship was assembled from six hull modules and six superstructure modules; the superstructure modules were fabricated in Whangarei, New Zealand, and hull modules were built at both Williamstown and Newcastle, New South Wales, with final integration at Williamstown. She was launched on 20 March 2004, and commissioned into the RAN on 26 August 2006 in Fremantle, Western Australia (the closest port to the ship's namesake city). Perth was the final Anzac-class ship to be constructed. Operational history In mid-2007, Commander Michele Miller became the first woman to command a major RAN warship when she assumed command of Perth. On 18 January 2010, Perth docked at the Australian Marine Complex in Henderson, Western Australia to be modified under the Anti-Ship Missile Defence Project. The upgrade, intended to improve the class' anti-ship self-defence capability, included the fitting of CEA Technologies' CEAFAR and CEAMOUNT phased array radars, a Vampir NG Infrared Search and Track system, and Sharpeye Navigational Radar Systems, along with improvements to the operations room equipment and layout. Both of the frigate's masts were replaced; the top of the aft mast now sits at , making Perth the second-tallest ship in the RAN. Because of the added equipment, additional ballast was added to improve the frigate's stability, and the ship's quarterdeck was enclosed. The additional weight brought the ship's full load displacement to 3,810 tons. After the upgrade was completed in October 2010, Perth was used to trial the modifications before they were rolled out to the rest of the Australian Anzacs: alongside and harbour trials at were successfully completed in February 2011, and full