Which tenet of airpower involves combining multiple forces for increased effect?

The concept of synergistic effects in airpower is centered around the idea that the combined impact of various forces and capabilities can produce a greater outcome than the individual contributions of those forces alone. This involves integrating and coordinating different elements, such as air, land, and sea power, as well as various types of aircraft and weapon systems, to create a unified and effective approach to mission objectives.

When forces work together synergistically, their interactions can enhance capabilities, maximize resources, and lead to successful operations that may not be achievable if those forces were deployed separately. For instance, the use of intelligence, surveillance, and reconnaissance assets in conjunction with strike aircraft can produce a more informed and impactful application of airpower, resulting in improved accuracy and effectiveness.

In this context, the other options do not encapsulate this principle as effectively. Balance refers to ensuring that capabilities are distributed appropriately to meet operational needs. Concentration emphasizes focusing combat power against a specific point or target to achieve maximum effect. Persistence speaks to the ability to maintain pressure over time, but does not inherently capture the collaborative and integrated approach that defines synergistic effects. Therefore, synergistic effects is the most accurate choice when discussing the benefit of combining multiple forces for increased effectiveness in airpower operations.