As the situation in Iraq worsens, America turns to more and more drastic tactics in attempt to prevent the crisis spiralling out of control.
Faced with an ever-more ruthless insurgency in Baghdad - despite President George Bush's "surge" in troops - US forces in the city are now planning a massive and highly controversial counter-insurgency operation that will seal off vast areas of the city, enclosing whole neighbourhoods with barricades and allowing only Iraqis with newly issued ID cards to enter.
The campaign of "gated communities" - whose genesis was in the Vietnam War - will involve up to 30 of the city's 89 official districts and will be the most ambitious counter-insurgency programme yet mounted by the US in Iraq.
The system has been used - and has spectacularly failed - in the past, and its inauguration in Iraq is as much a sign of American desperation at the country's continued descent into civil conflict as it is of US determination to "win" the war against an Iraqi insurgency that has cost the lives of more than 3,200 American troops. The system of "gating" areas under foreign occupation failed during the French war against FLN insurgents in Algeria and again during the American war in Vietnam. Israel has employed similar practices during its occupation of Palestinian territory - again, with little success.
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