I put this into google search:
dod w2 box 14 code k
And got this link for your reference, you might want to bookmark it:
https://support.taxslayer.com/hc/en-us/articles/360015701832-What-are-W-2-Box-14-Codes-for-Defense-F...
Ask your taxpayer client about "K = Pre-tax dental and vision deductions"
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