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Directory Results for Improved Materials and Manufacturing Methods for Gun Barrels. Part I. Correlation of behavior of the materials in firing tests and vented bomb experiments, results of mechanical property tests, and economic limitations were used to select three mater to Improved Materials for Photochromic Optical Memory Subsystem (POMS). Photochromic materials based on transition metal oxides were synthesized during this effort, and evaluated for potential use in future optical processing components and subsystems.