of whom fled by boat and were known as boat people. Between 1975 and 1998, an estimated 1.2 million refugees from Vietnam and other Southeast Asian countries resettled in the United States, while Canada, Australia, and France resettled over 500,000. China accepted 250,000 people. Of all the countries of Indochina, Laos experienced the largest refugee flight in proportional terms, as 300,000 people out of a total population of 3 million crossed the border into Thailand. Included among their ranks were "about 90 percent" of Laos's "intellectuals, technicians, and officials." An estimated 200,000 to 400,000 Vietnamese boat people died at sea, according to the United Nations High Commissioner for Refugees. In the United States Failure of U.S. goals in the war is often placed at different institutions and levels. Some have suggested that the failure of the war was due to political failures of U.S. leadership. Others point to a failure of U.S. military doctrine. Secretary of Defense Robert McNamara stated that "the achievement of a military victory by U.S. forces in Vietnam was indeed a dangerous illusion." The inability to bring Hanoi to the bargaining table by bombing also illustrated another U.S. miscalculation, and demonstrated the limitations of U.S. military abilities in achieving political goals. As Army Chief of Staff Harold Keith Johnson noted, "if anything came out of Vietnam, it was that air power couldn't do the job." General William Westmoreland admitted that the bombing had been ineffective, saying he doubted "that the North Vietnamese would have relented." U.S. Secretary of State Henry Kissinger wrote in a secret memo to President Gerald Ford that "in terms of military tactics … our armed forces are not suited to this kind of war. Even the Special Forces who had been designed for it could not prevail." Hanoi had persistently sought unification of the country since the Geneva Accords, and the effects of U.S. bombings had negligible impact on the goals of the North Vietnamese government. The effects of U.S. bombing campaigns had mobilised the people throughout North Vietnam and mobilised international support for North Vietnam due to the perception of a super-power attempting to bomb a significantly smaller, agrarian society into submission. In the post-war era, Americans struggled to absorb the lessons of the military intervention. President Ronald Reagan coined the term "Vietnam Syndrome" to describe the reluctance of the American public and politicians to support further military interventions abroad after