You cut and paste a little too fast, and you cross a line.
On one side of this new controversy, you have a critic who says the Army is not allowed to plagiarize in its manuals - and if the plagiarization is then reprinted commercially by a university press for its own gain, the damage has been aggravated.
On the other side, you have a defense in the form of Attribution rules do not apply to us. We are practitioners, not academics. What a strange defense, especially given that those failing to attribute (or more thoroughly paraphrase) were themselves academics!
Small Wars Journal has the whole sad story.