Any modern military defers field-level decision making to soldiers in the field. It’s become an absolute necessity as the post WW2 diplomatic regime put in requirements for individual soldiers to refuse illegal orders and making them personally liable for war crimes.

Individual soldiers don’t plan wars, obviously they don’t have a high enough level view to do that adequately. So much of war planning is logistics and not tactics or strategy. The idea is to get the troops there, make sure they have enough weapons and ammo, give them their objectives, then let field commanders do their jobs.