It's not their domain, it's the domain of the Commander-In-Chief and his entire apparatus. The War Department are meant to be more focused around the tools they bring to the table.
The first line in the article describes a crisis between two powers. Not a theater of war.
Fair enough and thanks for the correction. I think my point may still stand: between the LLM or the Chief ... which decision maker will be most in tune with the long-term common good of the populace?