Pacific during WWII, use symbolism to commemorate, document, and narrate an event in history?

Explanation:

This photograph symbolizes the event by displaying the sorrow and pain of the soldiers atop the rubble and death of battle, while at the same time commemorating their courage and strength as they place an American flag at the scene of the battle. It serves as a reminder of their courage and the strength America has as a nation. It documents history for ever more and narrates the final scene of the battle.

i believe their role is to instruct certain sections on when they are to join and when they are to stop