In a statement released on Wednesday, the US army confirmed that all three died at about 10pm (1900 GMT)following an ambush just outside the capital.
Their deaths bring the US toll in Iraq since the beginning of the latest war on Iraq to 1079. The latest ambush came as US warplanes continued to bomb Falluja through the night, killing at least six civilians.
One bombing raid completely destroyed the besieged town's most famous restaurant, killing the owner's son and nephew who had been looking after the shop during the night.
The second attack struck a house that had already been bombed before, flattening several homes in al-Askari neighbourhood as well as killing at least four members of an Iraqi family and injuring an unknown number of others.
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