The success of any operation depends on proper mobility and embarkation planning and execution, whether movement is by land, sea, or air. For units to rapidly deploy, commanders must ensure their units maintain the highest degree of embarkation readiness. Marine Corps Reference Publication (MCRP) 4-11.3G, Unit Embarkation Handbook, addresses the doctrine, techniques, and procedures for effectively managing a unit embarkation program and planning and executing mobility and embarkation operations. In the case of amphibious embarkation operations, a Marine expeditionary unit is used as an example throughout. This publication cancels MCRP 3-31B, Amphibious Ships and Landing Craft Data Book, dated 29 August 2001 and supersedes MCRP 4-11.3G, Unit Embarkation Handbook, dated 10 December 2004.