A plural-panel, plural-layer armoring system including (a) an outer layer of elongate, side-by-side adjacent, laterally-interlocking, hardened-material armor panels having long axes substantially paralleling one another, and (b) a contacting, but not bonded-to, inner layer of elongate, side-by-side adjacent, closed-cell foam panels having long axes substantially paralleling one another and disposed at angles relative to the long axes of the armor panels.