Open to creative interpretations, but my initial thought was for a crest or shield using the look and color palette of the American flag with the Manchester United devil superimposed on top.<br />
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The devil can be either Old Glory Red or Old Glory Blue depending on the design of the shield.  If stars are to be incorporated in your design, there should only be 3 (representing the number of European championships)<br />
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Colors of the flag can be found at http://london.usembassy.gov/rcflags.html

UNITED in the States