The Signal Corps was another small but useful part of the Union Army. Strangely, they appear to have been dressed in cavalrymen's jackets and trousers and although not seeing active combat were well armed with revolvers.
Enlisted signalmen wore badges with crossed signal flags motifs on their sleeves. During the Peninsular Campaign when there was a brief craze for using manned balloons to look down on enemy positions, a special unit of signalmen was created who wore badges with 'BC', standing for Balloon Corps, motifs on their sleeves.
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