If you wish to retain the original livery (gray USAF livery) while in OpenIV extract the file spooky.ytd. I typically extract the original .ytd to the same folder as the dlc.rpf and rename it to origspooky.ytd.
When ready to overwrite with the USAF Vietnam era livery, toggle "Edit mode", top right button, and drag spooky.ytd from the extracted zip file and drop here:
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