There are about 900 U.S. personnel deployed to Syria, most of them in the east, as part of a mission fighting the remnants of the Islamic State.
In March, 25 U.S. troops were wounded in strikes and counter-strikes in Syria, which also killed one U.S. contractor and injured another.
U.S. forces first deployed into Syria during the Obama administration's campaign against Islamic State, partnering with a Kurdish-led group called the Syrian Democratic Forces.
Thousands of other Islamic State fighters are in detention facilities guarded by Kurdish-led Syrian Democratic Forces, America's key ally in the country.
U.S. officials say that Islamic State could still regenerate into a major threat.
Persons:
Obama, Bashar al, Assad, Phil Stewart, Kanjyik Ghosh, Kim Coghill, Gerry Doyle
Organizations:
U.S, military's, Command, U.S . Central Command, Islamic State, Syrian Democratic Forces, Islamic, Thomson
Locations:
Syria, U.S, Islamic State, Iran, Kurdish, State, Iraq, Russia, Iranian, Washington, Bengaluru