Why VLS cells have a service life

Do vertical-launch-system cells have a finite service life comparable to a gun barrel?

Yes. Repeated flash heating from rocket exhaust stresses the metal, so cell inserts, cooling arrangements, and fatigue life matter.

VLS cells have a finite service life because rocket exhaust repeatedly flash-heats their structure. The rapid heating stresses the metal. Inserts and cooling arrangements help manage that exposure, although they do not remove the underlying fatigue problem. The comparison with gun barrels concerns repeated material damage during weapon use.