 On 30 September at Newmarket, U S Navy Flag, ridden by Heffernan, was one of twelve colts to contest the Group 1 Middle Park Stakes over six furlongs and started at odds of 10/1.The Railway Stakes winner Beckford started favourite, whilst the other runners included Sioux Nation, Cardsharp, Rajasinghe, Unfortunately (Prix Morny) and Sands of Mali (Gimcrack Stakes).U S Navy Flag tracked the leader Hey Jonesy before taking the lead approaching the final furlong.