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Millar earned thirteen caps for the U.S. national team between 1968 and 1972, scoring 8 goals (or 9 depending on the sources) during that time. He made an auspicious debut with the team by scoring a hat trick in a September 15, 1968 tie with Israel. Some records only attribute 2 goals to Millar as he and Willy Roy apparently kicked the ball nearly simultaneously which leads to the discrepancy in his stats.