What is the purpose of side boys during a ceremony?

The purpose of side boys during a ceremony is to line up on either side of the gangway during side honors. This tradition is part of naval protocol and serves to honor high-ranking officers or dignitaries as they come aboard or leave a ship. The presence of side boys signifies respect and is a visual demonstration of the honor being extended to the individual. Traditionally, when an officer boards or departs from a ship, side boys stand at attention to mark this important event, adding to the formality of the occasion.

The other choices do not accurately describe the specific role of side boys in this context. While providing security is important for ship's officers, that is the function of a different role entirely. Likewise, side boys do not represent ceremonial flags during parades nor do they provide support for ships in distress, as their primary function is dedicated to honoring distinguished individuals during ceremonies on board.