U S Navy Flag was a Group 2-placed winner in the first few months of his juvenile year, but it was from late August that he truly showed what he was capable of at that age. He was a wide-margin winner of the Group 3 Round Tower Stakes, a half-length winner of the Group 1 Middle Park Stakes, and then a two-and-a-half-length conqueror of Mendelssohn in the Group 1 Dewhurst Stakes.