Your commanding officer says go 100 miles per hour and don’t stop until you get to the rendevous point, you go 100 miles per hour. And if it’s General Mattis giving the order, don’t even think about stopping.
I have always fallen back on my military experience when taking my marching orders from those above me in civilian life. If they say they want something, I deliver. If I can’t, I give them plenty of notice and reasons for it.
Sadly, in the military, things are different. You can’t give notice and reasons. You have to deliver, because people’s lives may well depend on your completion of your mission. I don’t think I could do some of those things men have to do in combat, both at the risk to themselves, and ordering other people to do things that may very well kill a lot of them.
I have the utmost respect for someone who can do that, and not get callous about it.