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Since the Constitution commits to the Executive and to Congress the exercise of the war power in all the vicissitudes and conditions of warfare, it has necessarily given them wide scope for the exercise of judgment and discretion in determining the nature and extent of the threatened injury or danger and in the selection of the means for resisting it...[i]t is not for any court to sit in review of the wisdom of their action or substitute its judgment for theirs.
[I]t is difficult to conceive of an area of governmental activity in which the courts have less competence. The complex, subtle, and professional decisions as to the composition, training, equipping and control of a military force are essentially professional military judgments, subject always to civilian control of the Legislative and Executive Branches.