U.S. Special Operations Forces on a training mission in Pakistan are playing an expanded but largely unseen role in the country's counterinsurgency campaign, working with paramilitary units to "hold and build" tribal areas as militants are cleared out.

U.S. defence and administration officials say the elite trainers, who currently number more than 100, have not and are not authorized to take part in Pakistani military offensives in the semi-autonomous tribal regions, known as the Federally Administered Tribal Areas, or FATA, along the Afghan border.

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