What is an example of a technique used in operations?

The correct choice is that the Army design methodology represents a technique used in operations. This methodology is a framework that assists military leaders in understanding, describing, and analyzing complex operational environments. It promotes critical and creative thinking to facilitate effective planning and execution of operations.

Army design methodology helps to establish a clear understanding of the operational problem which in turn enables the development of a sophisticated operational approach. It is primarily focused on the cognitive processes necessary for mission analysis, enabling leaders to make informed decisions based on a comprehensive understanding of the factors at play.

In contrast, the other options represent useful tools or procedures within military operations but do not specifically exemplify a technique in the same way. Standard Operating Procedures (SOPs) serve as guidelines for routine functioning, while the Nine-line MEDEVAC is a specific format for requesting medical evacuation. Line of duty investigations relate to inquiries into incidents impacting service members, rather than operational techniques. Thus, while all options have their importance, the Army design methodology distinctly illustrates a strategic approach utilized in operations.