A new Joint Chiefs of Staff publication (pdf) describes operational principles for executing deployment and redeployment — meaning transfer or withdrawal — of U.S. military forces.
“Redeployment operations, particularly for combat units, … should be identified and planned as early as possible,” the document instructs. “The operation or campaign is concluded when the national strategy end state is achieved and redeployment operations are complete.”
“Although the emphasis of this publication is on overseas deployments and redeployments, deployments within the homeland are possible in support of homeland defense and civil support.”
See “Deployment and Redeployment Operations,” Joint Publication 3-35, 7 May 2007.