communications offices, conference room and Commanding General's office were housed in the vertical stem of the "E", with the three outstanding legs housing the various other offices. Intersections of the wings with the stem of the building required the use of special gutters and filler panels as in other buildings, The code room in this building was constructed entirely of reinforced concrete and provided with a fireproof vault door equipped with a combination locking device. To provide maximum security, special consideration was given to all openings from the message center and teletype rooms, and vertical steel bars were provided at exterior openings. Ultimately, instructions were received to soundproof as nearly as possible the Commanding General's office and the adjacent conference room, To accomplish this soundproofing, ceilings with wood joists were installed and inorganic acoustical tile was applied over plywood sheathing. In the general's office, acoustic tile and plywood sheathing were applied to wood furring strips affixed to the aluminum building fraring. In the conference room, the enclosing interior partitions were framed with wood studs and sound deadening batts to obtain greater sound reduction through these walls. One end of the conference room was equipped with a sliding map board and a draw curtain, both suspended from overhead tracks. A low storage case was constructed along the exterior wall, The design of the photo laboratory presented special problems in that it was necessary to provide both airtight and lighttight linings for the aluminum building. This was accomplished by affixing plywood panels to the interior surfaces of the aluminum structure. Because the central two-thirds of the building were to be air conditioned as well, a ceiling was installed in order to reduce the volume of space. Walls and ceilings were insulated and a vapor seal was applied. In effect, a complete wooden structure was built within the standard aluminum building. After construction of the building was well under way, two major changes were requested by AEC. In March 1950, plans were revised to include two additional dark rooms. This change required an addition of eight feet to the building length, and this addition involved considerable engineering and construction change. Later, in January 1951, instructions were received to provide a refrigerated film storage space, Because it was not feasible to provide this space within the building, a refrigerator was placed outside, adjacent to the building, and an enclosed passage provided access to it from the laboratory rooms. At the same time a "chilled water" system was incorporated for service to the labs and dark rooms. Cooling units were located outside the structure, near the film storage refrigerator. Laundry facilities were housed in a standard aluminum building with a separate aluminum boiler house constructed adjacent to and near the central portion of the laundry proper. Although the 24-foot width was not ideal for the equipment layout, an efficient plan was developed by careful study. 5-112 The original layout and the equipment selected were