What secondary mission is specified for Pathfinders?

The secondary mission of Pathfinders is to provide advice and limited aid to airborne or air assault units. This role emphasizes the expertise that Pathfinders bring in coordinating airborne operations and ensuring that units on the ground receive essential guidance to enhance their effectiveness during air operations.

Pathfinders are trained to be highly skilled in various aspects of airborne operations, which enables them to work closely with airborne or air assault units, offering tactical advice based on their extensive knowledge and experience. This integration is crucial as it allows for seamless operations and maximizes the effectiveness of air mobility in support of ground forces.

The other listed options, while they may represent important roles in military operations, do not align specifically with the designated secondary mission of Pathfinders. The focus is firmly on assisting and enhancing the capabilities of airborne units, making the chosen answer accurate in reflecting the Pathfinders' responsibilities.