Fitch Inc., a debt rating agency, said Friday that it has assigned United Defense LP a debt rating indicating some credit risk after the company took out three loans totaling $850 million. Fitch cited concerns over the company's vulnerability to the Defense Department's ongoing review of major acquisition programs including the Bradley, Crusader and DD-21. United Defense recently took out a six-year, $225 million revolving credit line; a $100 million six-year loan; and an eight-year, $525 million loan. Some of...