It's actually not that important, no front line ( Fast Air) operate from it, most of the active Airbases for actual combat missions are either Balad for the Iraqi AF F16's, Taji for the Iraqi Rotary wing, and Al Asad (mixed).
I am presently running 2 security teams out of Taji, and see and hear the Mi28's and Mi 35's on a regular basis, my best guess is that Al Mursanat is mostly logistic only to replen the FOB's in and around that Location (Near Korean Village)
Now......if they were to expand to cover Al Asad, that would be most welcome too, went there many many times between 2006-2008.