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The last UK and US troops left Iraq this week as the anti-Islamic State coalition mission formally ended, a withdrawal agreed two years ago and long demanded by Baghdad; questions remain over Washington's lasting influence in the country. Senior Iranian IRGC officials seized on the withdrawal, with adviser Mohammad Reza Naqdi saying it shows US regional power is 'not as portrayed,' while Quds Force commander Esmail Qaani said the US faces a 'humiliating situation' amid growing 'resistance' across the region.