The color guard for a parade.
color guard definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the persons carrying and escorting the colors (flag) in a parade, ceremony, etc.
color guard definition by American Heritage Dictionary
The ceremonial escort for the flag, as of a country or organization.