groups. it is not clear which group was shorting small arms at u.s. troops, u.s. troops did not return fire. u.s. special operations troops drive around with american flags flying in the open, not typical procedure. the pentagon says more than 50% of the city has been recaptured by u.s. backed syrian fighters. they are supported out round-the-clock by hundreds of marines outside the city. they increasingly faced stiffer resistance by an estimated 2,000 isis fighters and hundreds of bombs hidden throughout the city. this week marks the three year anniversary of u.s. involvement in the war against isis, u.s. officials tell me 80 isis leaders have been killed as part of the annihilation plan. >> jon: as coalition forces