DEFENCE giant manufacturer BAE Systems, which is one of the region's largest private sector employers,  said it had returned to profit during the first half, but warned of "challenging trading" ahead as governments axe spending.BAE Systems' net profits of £618m in the six months to June 30, compared with a loss of £82m last year, when it reported huge impairment charges on its acquisition of US company Armor HoldingsTurnover at the company, which employs nearly 13,000 in the region making the Eurofighter......for the full story register now for free or login below...