Defense Secretary Donald Rumsfeld is expected to travel next month to Asia to meet with defense ministers from the region and participate in a security conference in Singapore, according to a source familiar with the event's planning. Pentagon officials have confirmed that the Defense Department will send a high-level representative to the Shangri-La Dialogue, hosted June 3 to 5 in the Southeast Asian city-state by the International Institute for Strategic Studies. However, a Defense Department spokesman declined to say exactly...