Technically, as Mike B. stated, GMC did indeed call their version of the Chevrolet LCF(Low Cab Forward), the "F" series, but to keep confusion down, most people go ahead and group them as LCF's as the Chevy guys do. My 1952 GMC COE, is actually a "F" model 470 series COE. 47-51 COE trucks were "HF" models, but I just call it a COE.
