OK. If TurboTax takes the 92054, then I would ask you to go to your Base postmaster and ask him/her if your mail will get to you with the 92054 - just to double check. If Yes, then you're set.
If the postmaster/mistress says, "No, you won't get your mail with this 92054 zip code", then look at this IRS webpage about a change of address form, print it, fill it out with the "correct" zip code (i.e. the one the Base post office actually uses) and mail it to the IRS.
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