Residents of Singapore have grown used to an army of social-distancing enforcers clad in red polo shirts, who politely but firmly impose the city-state’s stringent coronavirus rules.

On cruiseships that operate out of the Lion City, they are called cruise ambassadors. Their polo shirts may be blue, but their mission is the same — to make sure that everyone toes the line.

Their presence on board is mandated by the Singapore Tourism Board (STB)'s CruiseSafe protocols that operators have to agree to before setting sail.