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This month, at least 10 US troops — including a US service member shot Sunday and five members of America's elite special-operations forces slain earlier — have been killed by Afghan police, soldiers or civilian workers at military installations. As of Sunday, that accounted for a stunning 32% of the 31 American military fatalities in Afghanistan reported thus far in August by the monitoring website icasualties.org. Aside from the devastating emotional blow dealt to families of the slain service members and the effect on morale in field units, insider shootings have wider-ranging repercussions. They have provided a propaganda bonanza to the Taliban, and could threaten a linchpin of the Western exit strategy: training Afghan security forces in preparation for handing over most fighting duties to them by 2014.