According to the US Army, kevlar vests have a service life span of 20 years. They are supposed to be stored flat and not exposed to direct sunlight unless being worn (i.e. supply can't leave a flat of vests exposed to weather).
Vests are to be inspected for water damage, tears, rips on a yearly basis and returned to depot in case any defects are discovered.
If a vest has been hit by fragments or bullets, the vest is to be carefully inspected and used if mission essential, but to be returned to supply at the first chance.
Ballistic plates are strictly to be replaced at the first chance. If, for any reason, the plate cannot be returned to supply, it is to be destroyed in such a manner as to render it useless.
Hope this helps!
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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