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The product is guaranteed to be reliable by 10 years of use by the military.

I can't think of a word or phrase we can use and that means something along the line of "guaranteed to be reliable". Even in the example above, the phrase makes little grammatical sense, because of the "by", but I swear there's a word or phrase you can use to fill in the blank.

The product is ____ by 10 years of use by the military.

  • The only thing I can think of that fits is backed by, but that doesn't mean the same thing as guaranteed to be reliable. – Jason Bassford Supports Monica Oct 6 at 3:34
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I can't think of anything that is relevant that fits in the blank (without any surrounding changes) followed by a "by". The first "by" is misplaced; it does not fit there. I think what you need is a "for".

The product is guaranteed to be reliable for 10 years of use by the military.

It stills sounds off to me.

Why not rephrase it? This is one option:

This product comes with a guarantee that it will be fully usable by the military for at least 10 years.

You could say "operational" instead of "usable". A more simpler rephrasing would be

This product guarantees 10 years of reliable use by the military.

  • but it was used for 10 years – woxim Oct 1 at 10:52
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Proven reliability.

Proven Dependability

Earned trust

The military has depended on it for the last ten years proving it's reliability

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