guns. The Mark 32 torpedo tubes aboard the Australian frigates were originally fitted with American Mark 46 anti-submarine torpedoes, but these were replaced with the French-Italian MU90 Impact torpedo prior to 2008. Toowoomba was the first Australian ship to fire an MU90 torpedo, during a test firing in June 2008, and Stuart performed the first 'warshot' firing of an armed MU90. The RAN commenced tendering for a helicopter design to replace the Seahawks aboard the Australian Anzacs in 1996, with a contract for 11 Kaman SH-2G Super Seasprite helicopters signed in 1997. In addition to the Anzacs, the acquired helicopter also had to be operable from the class of offshore patrol vessels the RAN was planning to build with the Royal Malaysian Navy (Malaysia later withdrew from the plan, and the RAN acquired the smaller Armidale-class patrol boats, which were not helicopter-equipped), with a second contract to be signed for these at a later date. In order to get the best capability for the cheapest price, the Australian Department of Defence opted to have Kaman acquire 40-year-old SH-2F Seasprite airframes decommissioned by the United States Navy, and fit modern flight systems to the reconditioned airframes. This approach led to major delays, and the helicopters were found to be inoperable in low-visibility conditions. By 2006, ten of the helicopters had been delivered, but none were permitted to fly. The Super Seasprite acquisition was cancelled outright in March 2008. Following the acquisition of the Romeo Seahawk helicopter variant, modifications to the Anzacs began to embark the helicopter. As part of the ANZAC Mid-life Capability Assurance Programme (AMCAP) upgrade under SEA 1448, Phase 4B, the SPS-49(V)8 was replaced with CEAFAR2-L L band phase array radar, along with replacements of the Cossar Mk XII IFF, Exelis ES-3701 ESM and upgrades to the LESCUT, AN/SLR-25C torpedo self-defence system, and the Nulka active missile decoy capability. Australia is planning to replace the Harpoon Anti-ship missiles with the Kongsberg Naval Strike Missile (NSM) by 2024. The Naval strike missile can be used against both land and sea targets and provides a significant increase in range. New Zealand modifications As soon as the New Zealand Anzacs entered service, a Phalanx CIWS weapons system, recycled from decommissioning various Leander frigates, was fitted to each new frigate in addition to the Mark 32 torpedo tube sets. In 1997, the RNZN began steps to acquire five Kaman SH-2G Super Seasprite helicopters