I suspect the tannoy will be there for the same reason it is on the gun lines. During a fire mission (tanks can usually do some level of indirect fire), or even a direct shoot, the headphones will get tangled up while performing the work of selecting ammunition, setting fuzes, loading the breech, discarding the old brass etc. With the tank in a stationary position, using the tannoy will allow a little more freedom for the crew in order to pass in target information.
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