Side boys are a naval tradition to welcome and send off dignitaries as they board and depart a Navy ship. Side boys are now also used for other ceremonial purposes on land such as during a change of command or retirement. They can be composed of either male or female members of the ship's crew, and act under the command of a Boatswain's mate, who gives commands with their pipe.
History
thumb|Pipe Aboard/the Side
In the age of sail, ships often couldn't come into smaller ports without risking getting stuck in the shallow water, and would anchor out in deeper water, taking the ships' boats back and forth from shore. Crew and cargo would either climb up a rope ladder or get hoisted up over the side. Climbing up a ladder wasn't very dignified, and even younger dignitaries who were able to climb a ladder often found themselves unaccustomed to the flexibility of the ladder, so 2 crew members were provided to assist those individuals safely aboard. Older dignitaries, who tended to be less agile would be hoisted aboard in a boatswain's chair. They also tended to be better fed than the average civilian and required more men to hoist them aboard, so the practice of assigning more men to assist senior dignitaries became common practice.
The Boatswain's mate would signal to the line of men heaving the boatswain's chair aboard with to "hoist away" or "avast heaving" with their pipe, and those signals and the ceremonial line of men on either side of the gangway now serve as a nautical courtesy for distinguished guests. The U.S. Navy provides this courtesy for any distinguished visitor, whether civilian or from another service, while the Royal Navy reserves the full ceremony for Naval Officers only.
When dignitaries arrive aboard the flight deck via aircraft on a carrier, the flight deck crew serve as sideboys wearing their colored flight deck jerseys, and are known as "rainbow side boys."
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