The Navy has fired six commanding officers since the start of the year -- triple its usual monthly rate -- including a foul-mouthed captain who was dismissed for subjecting her crew to "cruelty and maltreatment" aboard a warship in the Pacific. Capt. Holly Graf, commander of the USS Cowpens, a guided-missile cruiser, was relieved of duty Jan. 13 after an investigation found she cursed so much at her 400-member crew that even the sailors -- no strangers to four-letter words -- were intimidated. According to the Navy inspector general's report released this week, officers complained that their captain humiliated them...