The US military has cracked down on terrorist commanders in Syria. They have been using the Hellfire AGM-114R9X missile to quietly take out some of the leaders in the group. The military often refers to this tool as the R9X. Recently, the weapon has been used for the second time within three months. The Wall Street Journal just recently reported its existence in May of 2019.
Source: https://www.wearethemighty.com/gear-tech/hellfire-sword-missile-killing-terrorists