1-12. These options that support operational or strategic purposes represent a starting point for developing a course of action (COA) to a specific tactical problem. Each decision represents a choice among a range of options. Each option balances competing demands and requires judgment. Tacticians use experience and creativity to outthink their opposing enemy commanders. The mission variables have many combinations that make each new tactical situation unique. Because enemy forces change and adapt to friendly moves during operations, there is no guarantee that the current plan remains valid throughout a single operation.