(Editor's Note: This story has been updated to include additional comments from CACI executives.) CACI International said Tuesday it has agreed to pay $550 million for L-3 Communications' national security solutions business, a services unit that works with the Pentagon as well as intelligence and civilian agencies. The deal would catapult CACI to nearly $4.4 billion in annual sales, making it one of the largest services contractors and suggesting the company intends to act as a consolidator as the...