Considering the available options, Richard Nixon sought to lessen criticism of the Vietnam War by "Replacing the leading General."
Other means by which Richard Nixon, who served as the President of the United States between 1969 to 1974, tried to lessen criticism of the Vietnam War by doing the following:
The Vietnam war occurred between the years 1955 to 1975.
Hence, in this case, it is concluded that option D, "decreasing the use of airstrikes, " is the wrong option or answer among the available options.
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