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First you need to know what the new tire tire tread depth was so you can determine % tread left. It is pretty easy to google the brand of tire & get the catalog with specs.
Here is Goodyear's https://www.goodyear.com/cfmx/web/gov/pdf/military_tire_brochure.pdf
general info on HMMWV tires...
Tires should all have date codes, but many of the military tires- especially the older ones- don't have date codes.
Lots of tires have a 19/32nds tread depth,, but that isn't a standard. You need to look at what the original tread depth was. The military off road tires usually have quite a bit...