Several services contractors say they're increasingly turning to products as a way to boost growth and differentiate themselves in a crowded market. CACI International in January said its two new acquisitions would expand its technology, while a top Leidos executive said the company is open to purchasing a pure products business. "It's part of a broader trend in services moving away from purely labor-based or human-delivered services more and more," Joey Cresta, an analyst at market research firm Technology Business...