They disappear in peace because peace is mostly theory. The people who merchant in theories, and who employ logisticians in war and ignore them in peace, are generals. Generals are a happy blessed race who radiate confidence and power. They feed only on ambrosia and drink only nectar. In peace, they stride confidently and can invade a world simply by sweeping their hands grandly over a map, point their fingers decisively up trrain corridors, and blocking defiles and obsticles with the sides of their hands.
Generals fear logisticians in war and, in peace, generals try to forget logisticians.
Romping along beside generals are strategists and tacticians. Logisticians despise strategists and tacticians. Sometimes a logistician becomes a general. This is why logisticians who become generals always have ulcers and cannot eat their ambrosia. The supreme excellence is to subdue the armies of your enemies without even having to fight them.