First published in 2004, Major Donald Carr's "Into the Unknown: The Logistics Preparation of the Lewis and Clark Expedition" is a valuable study examining the key logistics components and considerations in the planning and execution of the mission. Modern logisticians will find themes in transportation, civilian contracting, indigenous (host nation) support, and others that still resonate today. Major Carr clearly demonstrates that Captains Lewis and Clark, in facing the daunting tasks of the great expedition, rose to the challenges and met them with ingenuity, detailed planning, discipline, leadership, and resolution-hallmarks worthy of reflection by today's junior leaders.