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What are auxiliaries in marching bands?
Many marching bands have auxiliaries that add a visual component to the performance.
What kinds of visual components do auxilaries add to marching bands?
For ceremonial marching bands, visual components could be a traditional color guard or honor guard. For drum & bugle corps and corps-style field band, dance lines, majorettes.
Are there any other interesting aspects about the Marching band article?
Auxiliaries may perform as independent groups.
Are marching bands popular?
In the early 1970s, color guards began to hold their own competitions in the winter. These became known as winter guard.

Question: Do they compete any other time of the year?
Self-contained rewrite: Do color guards compete any other time of the year besides winter as winter guard?