WASHINGTON (AP) - Former Defense Secretary Donald H. Rumsfeld defended himself and took no personal responsibility Wednesday for the military's bungled response to Army Ranger Pat Tillman's friendly-fire death in Afghanistan. Rumsfeld, in his first public appearance on Capitol Hill since President Bush replaced him with Robert Gates late last year, reiterated previous testimony to investigators that he didn't have early knowledge that Tillman was cut down by fellow Rangers, not by enemy militia, as was initially claimed. He told a House committee hearing that he'd always impressed upon Pentagon underlings the importance of telling the truth. "Early in my...