The United States has spent 70 years and tens of billions of dollars training Arab militaries—with almost nothing to show for all the effort. Time and again, America’s Arab allies have failed to live up to martial expectations. The U.S.-trained Egyptian Armed Forces performed miserably in 1991 during Operation Desert Storm. If anything, they did somewhat better under Soviet tutelage in the 1973 October War. The U.S.-trained Iraqi Army collapsed when attacked by a couple thousand Islamic State zealots in 2014. The U.S.-trained Saudi military fell flat on its face when it intervened in Yemen in 2015, and it has become badly stuck there.