What are the four elements involved in sling load operations?

The four elements involved in sling load operations are indeed the Supported Unit, Supporting Unit, Receiving Unit, and Pathfinder Unit.

The Supported Unit is the entity that requires the load to be delivered, facilitating the overall mission objectives by ensuring the proper items, equipment, or supplies are available. The Supporting Unit pertains to the aerial unit or aviation assets that provide the lift capability to transport the load. This unit is critical as it directly conducts the operation of moving the load through airlift.

The Receiving Unit is the organization or group that will take custody of the load upon arrival at the destination, ensuring it gets to the designated location for its intended purpose. Finally, the Pathfinder Unit plays a crucial role in coordinating the sling load operation, which includes preparation, planning, and safe execution of the lift, as well as ensuring communication and situational awareness during the operation.

Understanding these roles highlights how effective collaboration between these units ensures the success of sling load operations in a military context, making option A the correct choice.