What is the meaning of assault follow-on echelon?

(DoD) In amphibious operations, that echelon of the assault troops, vehicles, aircraft, equipment, and supplies that, though not needed to initiate the assault, is required to support and sustain the assault. In order to accomplish its purpose, it is normally required in the objective area no later than five days after commencement of the assault landing. Also called AFOE.
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APAMilitary Dictionary (DoD). (2011). assault follow-on echelon. Retrieved October 1, 2026, from http://smartdefine.org/assault_follow-on_echelon/definitions/1960427
ChicagoMilitary Dictionary (DoD). 2011. "assault follow-on echelon" http://smartdefine.org/assault_follow-on_echelon/definitions/1960427 (accessed October 1, 2026).
HarvardMilitary Dictionary (DoD) 2011, assault follow-on echelon, Smart Define, viewed 1 October, 2026, <http://smartdefine.org/assault_follow-on_echelon/definitions/1960427>.
MLAMilitary Dictionary (DoD). "assault follow-on echelon" 4 April 2011. Web. 1 October 2026. <http://smartdefine.org/assault_follow-on_echelon/definitions/1960427>