The military takes writing seriously.[1] People write things which are acted upon by others. The reader needs to understand clearly what is intended. Especially when they are out of communication with the sender.
It's worth understanding the military five-paragraph order format.[2] Not because it's used much in civilian life, but because it's a checklist for what must be covered in an order. Note especially "Commander's Intent" and "Desired Endstate". A key point in combat orders is knowing why something is being done. Because the enemy gets a vote. If things don't go as planned, then what?
[1] http://tsg3.us/tnsg_lib/pldc_school/wobc/is_1460_materials/c...