TSR2 got the first three right.” Sidney Camm, Designer of the Hawker Hurricane and the Harrier on the cancellation of his final project, the TSR2 1 THE FOURTH DIMENSION EXECUTIVE SUMMARY Since 1997, the Government of Canada has engaged in a process to replace its tactical fighter fleet of 122 CF-18 Hornets, which were acquired in the 1980s. [...] Program troubles in the United States, two deeply flawed oversight reports by the Parliamentary Budget Officer and the Office of the Auditor General of Canada, as well as a series of errors by the government resulted in a loss of support for the project. [...] The engine fire spoke to some of the most deep-seated criticism of the project in Canada, and fearing the potential political fallout, the Harper government elected to change course on the impending de- cision. [...] Not having a comprehensive understanding of all factors – from a clear appreciation of the assessed future security environment, the F-35 capabilities to meet the assessed threats (especially the technical matters regarding the aircraft’s performance capabilities), and to the intricacies of the development and procurement processes, a decision to essentially re-start the process was made. [...] The Clinton-era drawdown of the US armed forces after the end of the Cold War saw the budget for new acquisitions slashed, with fighters bearing the brunt of the cuts.