PGUP raises the attack periscope as long as you are holding down the button.
PGDOWN lowers the attack periscope as long as you are holding down the button.
CTRL + PGUP automatically raises it as high as it will go.
CTRL + PGDOWN automatically lowers it as low as it will go.
And I believe the same commands work for the Insert/Delete keys and those control the observation periscope. These animations are visible from the external camera.
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