SG2: GMS/P vs air units

Just wanted to check with others about my interpretation
of using GMS/P vs VTOLs/aerospace fighters.  According
to page 48, "EFFECTS OF ON-TABLE ANTI-AIR FIRE" it seems
like GMS/P can be used in the AA role, but at a die shift
down.  Is this right?

Thanks,
Ted
		     
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