If you wish to retain the original Bare Metal USAF livery, while in OpenIV extract the file f104c.ytd. I typically extract the original .ytd to the same folder as the dlc.rpf and rename it to origf104c.ytd.
When ready to overwrite with the USAF SEA F-104C livery, toggle "Edit mode", top right button, and drag c104C.ytd from the extracted zip file and drop here:
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