In his strongest statement yet on Libya, Defense Secretary Robert Gates reiterates that the U.S. would not send ground troops. The administration is still considering whether to provide arms to the rebels, but what opposition forces need most is training, he says.And at Hot Air, "Gates kinda sorta threatens to resign if Obama sends ground troops into Libya." RELATED: At NYT, "Gates Says Other Nations Should Arm Libyan Rebels" (via Memeorandum).