field building the frame. Galvanized steel prefabricated structures of various types are available but would require considerable modification to fill all requirements for the various uses to which they will be subjected. The useful life of a galvanized steel structure in the Eniwetok area is problematical due to scraping off or destroying the galvanizing during shipment and erection as well as from the electrolytic action when pinholes are present in the coating. shown in the A.S.T.M. Atmosphere Exposure Tests dated 2/27/hibs This fact is Observations made at the site, showed very rapid deterioration of this material when exposed to the combination of high humidity and salt spray. Galvanized steel buildings are approximately 15 percent cheaper in initial cost than prefabricated aluminum buildings, but they do not give as comfortable housing conditions due to the high degree of heat reflection of aluminum. Aluminum Structures. We, therefore, made an exhaustive study of all types of available or contemplated forms of aluminum structures. Of these structures, the vertical sidewall type as shown on Plate 7 seems to be nearest ideal due to east of erection, ventilation facilities and low initial cost. This type of structure is made up of pre-cut and die stamped elements which may be completely assembled in the field with no cutting or fitting and requiring only wrenches and screw drivers. These structures are proposed to be erected on concrete slabs using aluminum anchor bolts and connections throughout. They are easily adapted to almost any desired size and combination using a standard width of 2) feet, entirely free of columns, with length as required in three foot increments. The standard height of sidewall is eight (8) feet but can be increased up to sixteen (16) feet. The walls can be made with three-fourths of the three foot wide panels open from within one foot of the floor to within a foot of the top of the panel, IV - 13