The army standard for reporting observations is by utilizing the salute report format. what does the s stand for?

In S-A-L-U-T-E report format, the S is stand for : Size

This report of format is made to create the observation about the enemy.

In this case, size refer to the amount of troops and the strength that the opponent might have. We need this information to determine the strategy that will use to anticipate or commemorating the offense.