array, and the site for CASA would be on Dugway Proving Grounds. The construction and deployment of CASA took place between 1988 and 1991. Construction activities were carried out at the University of Chicago in the Accelerator Building of the Enrico Fermi Institute. The completed scintillation detectors, along with electronics, were shipped to Utah in large semi-trailers, where they were installed by students, postdocs and faculty. An initial array of 49 detectors became operational in 1989, followed by a 529-detector array in 1990. Standard science operation of the full 1089-detector CASA array (along with the 1024-counter muon array) started in December 1991. CASA operated very successfully, largely without interruption, until 1997. During that time a total of approximately 3 billion air showers events were recorded. Partial operations continued for several more years, in conjunction with the BLANCA and DICE experiments. The various experiments at the site, including CASA, ceased operation in 1999. Science The scientific results from CASA-MIA encompassed a dozen scientific publications and covered topics in three broad areas of high-energy astrophysics: gamma-ray point sources, diffuse gamma-ray sources, and cosmic ray physics. Gamma-ray point sources: CASA-MIA set stringent limits on the emission from all sources that had been reported by earlier experiments, including Cygnus X-3 and Hercules X-1, the Crab Nebula, and known high-energy active galactic nuclei. For these sources, the CASA-MIA limits were typically two to three orders of magnitude lower than the flux levels reported by the previous instruments. Searches were also made for transient and period emission from point sources and a general survey of the overhead sky was also carried out. Diffuse gamma-ray sources: the rejection power of the large muon array allowed CASA-MIA to study diffuse gamma-ray sources with great sensitivity. The most significant result came from a search of diffuse isotropic emission, which provided a limit on the electromagnetic fraction of the cosmic rays at a level less than 2 x 10−5 at the highest energies. Another significant result came from a study of diffuse emission from the Galactic plane. A separate study searched for bursts from arbitrary directions in the sky to constrain short timescale cosmic events, such as the explosions of primordial black holes. Cosmic ray physics: with its large and uniform air shower array, couple with a large muon detector, CASA-MIA had good capability to making measurements of the properties of the ultra high energy cosmic rays. The electron and