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Long wars are antithetical to democracy. Protracted conflict introduces toxins that inexorably corrode the values of popular government. Not least among those values is a code of military conduct that honors the principle of civilian control while keeping the officer corps free from the taint of politics. Events of the past week -- notably the Rolling Stone profile that led to Gen. Stanley A. McChrystal's dismissal -- hint at the toll that nearly a decade of continuous conflict has exacted on the U.S. armed forces. The fate of any one general qualifies as small beer: Wearing four stars does not signify indispensability. But indications that the military's professional ethic is eroding, evident in the disrespect for senior civilians expressed by McChrystal and his inner ...