Thank you for the reply, I have verified game files multiple times. There was a suggestion to delete the file from the vanilla addons folder as well and re-verify.
Also, this is occurring on SP not multiplayer or any servers.
I've been trying to research this error (You cannot play/edit this mission; it is dependent on downloadable content that has been deleted. a3_character_f) for when I save and load any mission on Arma. I've downloaded new mission mods as well and it does the same thing. I've seen where people suggested deleting old save file or copying them and move around or renaming and nothing has worked. I've tried to research what mod could be missing as well and it doesn't come up with anything. Someone told me to find the file and delete in the Arma folder but this only made the error say something different.