Original sentence: The insignia used by officers in the period 1955-1965 were similar in style to those used by the military of the Soviet Union at the time, with the primary differences being the existence of an additional field officer rank, and the insignia of
Edited sentence: The insignia used by officers in the period 1955-1965 were similar in style to those used by the military of the Soviet Union at the time, with the primary differences being the existence of an additional field officer rank, and the insignia of the highest general officer rank being four stars instead of one larger star