Communications flows in all directions since many of the brightest and most competent technically are well down in the hierarchy. Risks are high in Research and Development, much is at stake, and it takes a long time to know if decisions are correct. Things are different in War Plans and Operations . The atmosphere is more tense and urgent. Work schedules are much more demanding.
Communications is much more top-down and directive.
There's less collaboration. Responsiveness to command is the norm. As might be expected there are important differences in culture between troop units in combat and those in training. Good leaders and brave people are the heroes in combat. The risks are high, the feedback fast.