What extra duties might cadets perform regarding the memorial monument?

Performing extra duties such as polishing and weeding is essential for the maintenance and preservation of the memorial monument. These tasks ensure that the monument remains in good condition and honors its significance properly. By polishing, cadets help keep the surface clean and visually appealing, reflecting respect for those commemorated. Weeding involves removing any unwanted plants that may detract from the monument's appearance or integrity, which signifies dedication and care for the space.

This hands-on approach not only maintains the monument's physical condition but helps instill a sense of responsibility and honor among cadets, reinforcing their understanding of the memorial's importance. The other options, while they represent valuable activities, do not directly relate to the physical upkeep and aesthetic care of the monument itself.