In retaliation for the beheading of 21 Egyptian Christians by ISIS in Libya, Egypt has launched airstrikes against ISIS targets in Libya.
What I think is extraordinary about this retaliation is that Egypt is doing this on behalf of a religious minority that has not traditionally enjoyed much esteem in Egyptian society. I cannot imagine Hosni Mubarak being moved to this kind of action had he still be in power. But General Sisi has cultivated good relations with the Copts and now he is standing with them in their hour of need.
While it's heartening to see both Jordan and Egypt standing firm, the United States needs to be all in and the Obama Administration's AUMF is barely going through the motions.