Which of the following is considered a supporting effort?

The choice that identifies a supporting effort as a unit designed to provide support to others is accurate because in military operations and organizational structures, supporting efforts are typically those entities that facilitate the primary mission's objectives by offering assistance, resources, or specialized functions. These units play a critical role in ensuring the main mission units can operate effectively without the need to manage all aspects of combat or operational readiness themselves.

Supporting efforts can include logistical units, medical support teams, intelligence resources, and more, which are all designed specifically to bolster the capabilities of frontline or main effort units. This collaborative structure allows for a more efficient operation where different units can concentrate on their primary directives while still receiving the necessary backing from support units.

In contrast, the other options represent units or roles that may play important functions within military operations, but they do not fit the definition of a supporting effort. For example, the most critical unit for mission success would be the primary effort, while the primary advisor on aviation medicine pertains to a specialized role that provides expertise rather than broader support. A unit responsible for developing flight orders is likely involved in mission planning or execution rather than serving a supportive role to others.