Final answer:
National security encompasses physical security and other related concerns, including economic, energy, and environmental security, together with a strong military. It also involves policies related to diplomacy and negotiations.
Step-by-step explanation:
Critical to security (as a principle of war) is the understanding that it embraces physical security and national security. National security encompasses a broad range of concerns, including economic security, energy security, environmental security, and a strong military. It also involves policies related to diplomacy, negotiation, and other interactions.