By Doug Gray, Senior Contributing Reporter
RIO DE JANEIRO - It may not be the most unusual sound to hear in the city, but the levels of firepower ricocheting off the hills of Dona Marta last week coupled with the gunship-style armed helicopters looping over Flamengo before going in for another pass above the favela undoubtedly raised alarm among residents.
It has been several months since the worst violence resulting from the new favela pacification program, and it looked like once again a . . .