Friday night's attack on Syria was not the first time the U.S. bombed the country. President Donald Trump also ordered strikes about the same time last year, also in response to reported chemical weapon usage.
Looking back, it's not clear how effective last year's strikes were. One airbase the U.S. fired at was back in use the next day. Military analysts told NBC News the strikes didn't alter the course of Syria's civil war.
And last year's strikes against Syria don't seem to have deterred the Syrian government from using chemical weapons again. This time, the Trump administration has said it was prepared to continue strikes until the regime stops its alleged use of chemical weapons.
Additional reporting from Newsy affiliate CNN.