BILL ROGGIO: A “Lasting Defeat” of the Islamic State Will Be Elusive.

Keep in mind that many analysts were quick to pronounce the Islamic State’s predecessor, al Qaeda’s Islamic State of Iraq, as defeated after the US surge that began in 2007 rooted out the jihadists from its sanctuaries across Iraq. By 2010, Iraqi and US forces killed the Islamic State of Iraq’s emir, Abu Omar al Baghdadi, and War Minister Abu Ayyub al Masri a.k.a. Abu Hamza al Muhajir, and the group was driven underground. But these setbacks did not deter the Islamic State of Iraq. Its new leader, Abu Bakr al Baghdadi rallied the Islamic State of Iraq’s remaining forces and reconstituted the organization. In Syria, the Islamic State of Iraq took advantage of the Syrian civil war to rebuild its strength. By 2012, it created the Al Nusrah Front, its branch in Syria, and was launching large scale raids inside Iraq, such as the one in Haditha in March 2012, that presaged the events of 2014, which saw Iraqi forces defeated in Anbar, Salahaddin, Ninewa, and Diyala.

The Islamic State is not alone in its phoenix-like rebirth after losing ground to local forces backed by the US. Al Qaeda branches in Somalia, Yemen, and Mali, have experienced major setbacks and lost ground it held, only to regroup and retake territory. The same is true with Boko Haram in Nigeria and Taliban branches in Afghanistan and Pakistan. Each of these countries have been in a state of perpetual war for well over a decade due to jihadist insurgencies.

Killing jihadis, as my colleague Bill Whittle says, is like mowing the lawn — a dreary job that must be done with some regularity or else it grows out of control.