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We examined the general phenomenology associated with the corrosion of Al Alloy 2024-T3. Copper redistribution is controlled by S-phase dealloying and matrix dealloying. Matrix dealloying of aluminum occurs owing to the increased pH that develops at the alloy/electrolyte interface owing to oxygen reduction. We summarize results of a detailed investigation aimed at determining the mechanism and magnitude of the oxygen diffusion limited current density during corrosion of Al Atloy 2024-T3. Our results show that oxygen reduction occurs via the standard 4-electron mechanism and that the oxygen diffusion - limited current density has a value of approx. 25 uA cm(-2)., Original contains color plates: All DTIC reproductions will be in black and white.

Military Operations in Urban Terrain present challenges that differ from those of conventional warfare. Often these arise because only limited force can be applied. To compensate, precise information about an opponent's location and condition is desired. This experiment demonstrates the value of such information when an occupied building is approached by coordinated Blue force, but calls into question its utility once inside., Original contains color plates: All DTIC reproductions will be in black and white.

Situational awareness is an issue of growing interest and importance in analyses of the modern battlefield. This report summarizes the results of a 22 factorial experiment in which two components of situational awareness were varied in a free play interactive war game. The two components were battlefield visibility (as presented on a workstation display) and the availability of unattended ground sensors. Half the trials were conducted with all Blue forces on the battlefield visible to all members of the Blue team; half were conducted with (Blue) players' visibility restricted to those units under his direct command. Similarly half of the trials were played without sensors. Analysis of variance and log linear analyses indicated that neither of these factors was significant, suggesting that the complexity of the engagements overwhelmed their impact.