I have had a look at the old plans, as Dan said, and saw that of the 5 schemes for NC ANG, one is used 3x, three are used 2x and one, 93-1458, is not used at all.
Now it would seem that the best way to fix this yourself is to decompile the plans into their three txt files, amend the aircraft txt file by adding this line:-
AC#464,340,"MAIW_HTAI_C-130H_RCH_XX_156_93-1458"
and then amending the flightplans txt file by altering one of the AC#460 entries so that the line begins:-
AC#464,931458, ....
Then recompile. That will solve your problem.
Now I am sure that the original flightplan author would wish me to tell you that decompiling/recompiling flightplans can create problems, each time you do it.
Now there are two two other options available here. One being to hope that we get around to updating the pack in the future to individual aircraft, as we do now, rather than representative ones, as we did with this one, or you can curse us forever.
Personally, I would prefer one of the first two rather than the third but its your choice
.
Hope this helps.