According to this article France24, Saudi Arabian fighters supported US drone strikes against Al Qaeda targets in Yemen. The unasked question is how are we striking targets in a country that the US has not declared war on? The same question went unasked when a US drone killed a cleric in Yemen (who held US citizenship). The US has had cause to declare hostilities against Yemen going back to 2000 when the USS Cole was bombed, however such unilateral action was not an option in the pre-9/11 world. Saudi Arabia supporting the strikes has more to do with the royal Saud family worries about and nuclear Iran than US concerns about Al Qaeda. Keeping US forces in the region means Iran will not be able to target Saudi targets without potentially striking US forces. It will be interesting what happens after the innauguration.