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. The target audience for MCRP 4-11.3G is the noncommissioned officer (NCO) through captain in the mobility/embarkation military occupational specialty and other NCOs/offi- cers assigned unit embarkation responsibilities. The guidance and relevant information herein provides commanders and their staffs an appreciation of the internal workings of a unit embarkation section and the critical role it plays in a successful unit deployment. This publication provides uniformity across the Marine Corps for integration into standing operating procedures. 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.