Abstract: An add-on armor system for releasable attachment to an external surface of a hull of a vehicle comprising a plurality of juxtaposed armor tiles. Each armor tile is releasably attached to the hull of the vehicle by means of a fastening assembly and has an attachment surface matching the hull portion to which it is attached. The fastening assembly is a snap-type assembly which has a first engagement member in form of a profiled shank and a second engagement member comprising a profiled socket serving as releasable catch for snappingly engaging the profiled shank. The fastening assembly further comprises a shock absorbing plate secured to the hull.