The F-15E’s primary role in Afghanistan is providing close-air support for ground troops.
http://www.af.mil/AboutUs/FactSheets/Display/tabid/224/Article/104499/f-15e-strike-eagle.aspx
“and for all intents and purposes, ALL F15E sorties are CAS...”
No qualifier regarding theater and such.
Not all F-15E sorties are CAS. Daily sorties flown world-wide are about 30/30/30; meaning deep strike missions, A/A missions, CAS training and “other.” Mostly training missions but one must keep the tip of the spear sharp.
Real world missions being flown include CAS but not all are.
Between the two, the A-10, it is the last of the cowboy flying you can find, a real stick-and-rudder man's jet. Not to say the F-15E is not fun and great, after all, what's not to like when strapping on a Cadillac of a jet with five-stages of after-burner and a radar that can work wonders.
All told, however, I enjoyed flying the Hog the most.