Why does your 10% discount for military veterans vary by store & not advertised by your stores?

I am a Vietnam War veteran. Bought a HD water heater 01/08/09 for $732.20 fm S'ville,SC store with HD card # 6035-3202-9311-7956. Never told by any HD employee about vet discount. Was told I was too late to get it after going back to same store. To be fair, request a retro discount of $73.22 be credited against my final pmt.

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