Booz Allen Hamilton's stock price is down about 18 percent since the company disclosed late last week it is under investigation by the Justice Department. On June 15, the company issued a statement announcing the probe , which it said is a "civil and criminal investigation relating to certain elements of the company's cost accounting and indirect cost charging practices with the U.S. government." Booz Allen said it is cooperating with the government, but that its own internal and external...