A military operation launched from the sea by naval and landing forces embarked on ships or craft with the principal task of landing forces ashore tactically into an environment ranging from the permissive to the hostile in order to accomplish the assigned mission: Planning-The period extending from issuance of the initiating directive to assault. Embarkation-The period during which the forces, with their equipment and supplies, are embarked in the assigned shipping. Rehearsal-The period during which the prospective operation is rehearsed for the purpose of: testing adequacy of plans, the timing of detailed operations, and the combat readiness of participating forces; ensuring that all echelons are familiar with plans; and testing communications. Movement-The period during which various components of the amphibious task force move from points of embarkation to the objective area. Assault-The period between the arrival of the major assault forces of the amphibious task force in the amphibious objective area and the accomplishment of the amphibious task force mission, ie the amphibious mission. Termination-The completion of securing of amphibious objective.

a military operation by both land and sea forces

a military operation launched from the sea by an amphibious force, embarked in ships or craft with the primary purpose of introducing a landing force (LF) ashore to accomplish the assigned mission