to 5 small bombs and been a factor why France never again conducted atmospheric testing. The NZ Labour Government admitted that not only France but the UK government opposed the use of its recently delivered British frigate on this mission. The French Government claimed in 1985 that the RNZ deployment to Muroroa in 1973 was one of the 'provocations that led to the attack by the French Intelligence service and Navy on the Rainbow Warrior in 1985. In November 1974, Canterbury deployed with Destroyer Squadron 5 of the United States Pacific Fleet off the West Coast for six months, the first time a RNZN frigate had operated as an integral part of a U.S. Navy force. While such joint operation was common for the RAN, it was not repeated in the 20th Century by the RNZN, possibly because while the deployment was approved by the Kirk/Rowling 3rd Labour Government, there was considerable official comment when the frigate returned to Devonport bearing the prominent insignia, US DESRON 5 and because integrated operations were restricted by lack of funding by the following Muldoon government for common Link 10 data link communication systems and baseline HYCOR chaff defence systems, and the standard for RNZN frigates was compatibility rather than commonality with, USN FF52 Frigates In April 1977 Canterbury and the Australian destroyer were assigned to escort the Australian aircraft carrier during a five-month return trip to the United Kingdom for the Queen's Silver Jubilee Naval Review. Priority for a planned new frigate (either a Type 21 frigate or Dutch Kortanear) and modernisation of HMNZS Taranaki, projects later cancelled by the Muldooon government, meant F421 received only a 12-month refit in 1980 to maximise seatime, and its mid life refit was delayed to Nov 1987 to June 1990, at a cost of $73 million, the most significant changes fitting of Dutch LW08 long range surveillance radar, Phoenix electronic warfare systems and general replacement of radar and sonar with new solid state systems in place of the original obsolescent, British equipment. Updating was similar but more limited to that carried out of HMNZS Wellington, as F421 did not receive the extra fuel tanks and greatly increased cruising range of Wellington. 1980s After the Argentinian invasion of the Falkland Islands in 1982, New Zealand Prime Minister Robert Muldoon offered to send Canterbury to join the Royal Navy's task force sailing south to retake the British territory.