The Islamic State of Iraq and al-Sham is threatening to take control of Balad Airbase, Iraq’s largest airfield and one of America’s most important military outposts during its occupation of the country.

Today, Balad still has plenty of vehicles and aircraft on the base that any terrorist group would covet, including Russian-made transport helicopters, surveillance planes, and a fleet of pickup trucks fitted with heavy machine guns.

Now, that airbase is coming under fire—and is in danger of falling into the hands of ISIS, according to U.S. intelligence officers, internal reports from Balad, and outside analysts. Reuters reported Wednesday that the base was now surroundedon three sides by insurgents and taking heavy mortar fire.  […]