Abstract: The shelter is constructed of composite, multilayer panels comprising an exterior skin aluminum sheet layer, a polymer composition foam layer, a divider skin aluminum sheet layer, an aluminum honeycomb layer, and an interior skin aluminum sheet layer. The five layers are bonded together to form the panel. In accordance with one aspect of the invention, the polymer composition foam layer has a scored surface to increase adhesive area and to increase the length of the shear failure line. In another aspect of the invention, the panels are closed out at at least two edges thereof with an extruded polymer-fiberglass closeout bar which is positioned between the inner and outer panel skins at the edge thereof and bonded thereto. These closeout bars are configured for rigid attachment between adjacent panels.