War in Syria
U.S. Conducts Most Airstrikes Against Targets in Syria
While this was the first time America directly attacked Syrian government forces, the air war over Syria has been ongoing. So far, the so-called Operation Inherent Resolve (OIR) has mostly targeted positions controlled by the Islamic State in Iraq and Syria. Most strikes by far are carried out by the U.S. Air Force.
All Syrian chemical weapons should have been destroyed. From October 2013, the Organisation for the Prohibition of Chemical Weapons (OPCW) oversaw the destruction of Syria's stockpile. However, there have been doubts this really happened. Syria signed the Chemical Weapons Convention, which bans the use of such weapons, in mid-september 2014.

Description
This chart shows cumulative U.S. & allied airstrikes in Syria as part of Operation Inherent Resolve (OIR)