is also installed. The core of the Anzacs' combat system was built around CelsiusTech's (now Saab) 9LV 453 Mark 3 distributed command and fire-control system. Construction On 14 August 1989, AMECON was awarded the tender to build the Blohm + Voss designed frigate. The frigates were to be constructed at the AMECON shipyard in Williamstown, Victoria (formerly Williamstown Naval Dockyard), but the modular design of the frigate allowed sections of the ships to be constructed throughout Australia and New Zealand, with final assembly in Williamstown. Each vessel was made up of six hull modules and six superstructure modules. All of lead ship Anzacs modules were assembled at Williamstown, but for later ships, the superstructure modules were fabricated in Whangarei, New Zealand, and hull modules were built at both Williamstown and Newcastle, New South Wales. Unlike previous shipbuilding contracts, AMECON was contractually obliged to meet only the navy's set commissioning dates for the ships; all other construction deadlines were to be determined at the shipbuilder's discretion. The second and fourth ships to be built were allocated to the New Zealanders. The third and fifth ships to be produced were earmarked for the RNZN in the event that approval to order two more frigates was given, with two more ships for the RAN to be added at the end of the production run. Project offsets meant that construction costs for the New Zealand ships were about 20% less than the Australian vessels. Steel cutting for the first ship, , commenced on 27 March 1992. Work on the first New Zealand ship, , began in February 1993. Anzac commissioned into the RAN in May 1996, and Te Kaha into the RNZN in July 1997. In early 2002, the first four ships found to have microscopic cracks in the bilge keel and hull plating. The ships' hulls were repaired and reinforced. Construction of the final vessel, , began in July 2003, with the vessel commissioning into the RAN in August 2006. Modifications and improvements The Anzac-class ships were designed with a minimum standard of offensive and defensive weapons, with other equipment fitted "for but not with". The RAN and RNZN began to plan for upgrades to their frigates before all of the ships entered service; these upgrades were planned and executed on a national basis. Australian modifications The RAN commenced plans to improve their frigates' combat capability in 1996, with the Warfighting Improvement Program