“Let civilian voices argue the merits or demerits of our processes of government; whether our strength is being sapped by deficit financing, indulged in too long, by federal paternalism grown too mighty, grown too rampant, by morals grown too low, by taxes grown too high, by extremists grow too violent . . . These great national problems are not for your professional participation or military solution. Your guidepost stands out like a ten-fold beacon in the night: Duty, Honor, Country.”