Which element refers to the rules of engagement and established procedures?

The element that refers to the rules of engagement and established procedures is best represented by tactics. Tactics encompass the specific methods and strategies that support the execution of military operations. This includes defining how forces are employed in a given situation, adhering to rules of engagement, and following established procedures that guide actions during operations. Tactics ensure that operations are carried out efficiently and effectively, allowing personnel to respond appropriately to a range of scenarios while adhering to strategic goals and operational guidelines.

In contrast, principles denote fundamental truths or guidelines that inform overall strategy but do not cover specific operational procedures. Terms and symbols refer to the language and imagery used to communicate operational aspects, while techniques describe the specific tools and methods employed within tactics. Therefore, tactics is the most appropriate term to describe the combination of rules of engagement and established procedures.