An example of the U.S. Navy guidon, which is used as the identifying flag for a company, for use when parading ashore.  There was once a red version used for artillery companies, but it was discontinued after World War II.  The central design is taken from the infantry battalion flag. The size of the flag is 20 1/8 inches by 20¾ inches.  The letters are supposed to be centered in a commercial gothic (i.e. sans serif) font 3½ inches high, with the "st", "nd", etc. after numerals being 2½ inches high.   If the names do not fit at that size, both lines of text can be reduced in size until the larger one fits (which was necessary in this version).  For more information, see here, here, and U.S. Navy document NTP 13(B) [1], section 1712.
Own work   (anchor design traced and cleaned up from File:USNavyBattalionFlagSpecs.png)
Carl Lindberg