Doctrine Man is to be found on Facebook. It is humor about the military in particular and politics and current events in general. Who Doctrine Man really is has been the subject of some controversy. It is beyond me, but apparently no few of the snide comments have subtexts that could only have come from conversations in the Pentagon. Doctrine Man is wholly credible, but that only underscores how common this misattributed quotation is.
"The nation that will insist upon drawing a broad line of demarcation between the fighting man and the thinking man is liable to find its fighting done by fools and its thinking by cowards."