The law underpinning the U.S. war against Al Qaeda is known as the Authorization for Use of Military Force, or AUMF, and it was passed one week after the 9/11 attacks. It doesn’t actually include the words “associated forces,” though courts and Congress have endorsed the phrase.

As we explained earlier this year, the emergence of new or more loosely-aligned terrorist groups has legal scholars wondering how effectively the U.S. will be able to “shoehorn” them into the AUMF