So, I love action movies; I hope you do too.
I have seen a couple of war or mission scenes where a sniper actively plans their target. Sometimes, they actively go to the potential location days ahead to map out the best and most effective location and understand how the distance to the target can affect the result.
If you have seen such a scene, then you have an Idea of "what strategic planning" is.
Learn more here :
Strategic mission planning is a high-level organizational objective that they intend to achieve considering every variable(the resources at their disposal and external factors they don't have control over) by effectively aligning the everyday actions of their team/employees to count towards achieving the set objectives