I copied your photos, and ran them through some photo analysis filters that I use, and it is readily apparent that the CO D (company D) markings were applied using a different paint then the ZI-704 markings immediately above them. The paint appears to be a uniformly "brighter" white. The "C-13" markings you mention would likely indicate the 13th vehicle of Company C. You might also read about the use of "X" in vehicle markings (see my first link). It indicates that the first unit designation is unique, requiring no additional description, and was used when referencing headquarters, headquarters companies, or special companies...
Nice bit of history you've found there!
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