there is a section on “what to carry” that sounds oddly like it was written by an ultralight packer.

To be fair, the heaviest part of the load a foot soldier carries into a combat zone always consists of weaponry, munitions, and similar tools of the trade. These are difficult-to-impossible to pare down, not to mention dangerous to leave behind. When you need an entrenching tool, you can't use your spoon as a multi-purpose substitute! So even when their kit has been pared to the sparsest minimum, an infantry soldier will never be allowed to pack an ultralight load.