From The BBC:The US hopes to get three out of four combat brigades requested by the army into Afghanistan by the summer, Defence Secretary Robert Gates has said.
Correspondents say his comments are the most specific to date on how the US will meet a pledge by President Bush to deploy 20,000 more troops.
Mr Gates is in Afghanistan to meet commanders on the ground.
He said Washington wanted to get thousands more troops into Afghanistan despite "operational difficulties".
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