I believe that list is for fabs who can supply the DoD with custom/proprietary chips (i.e. with business models similar to TSMC or Samsung but for defense related products). Intel has not been in that line of business so there is no point in joining the program.
They did recently announce two fab customers, an FPGA manufacturer and then something else that is also low volume and obscure. So maybe the DoD can make it worth their while.
That one FPGA manufacturer, by the way, WAS started by people associated with the DOD intelligence apparatus. I can't remember the name of the company though, but they're making 22nm FPGAs on Intel's tri-gate process that they introduced with Haswell.
