What is the meaning of flank guard?

Showing "flank guard" (corrected from "also flank guard") | add "also flank guard" definition

(DoD, NATO) A security element operating to the flank of a moving or stationary force to protect it from enemy ground observation, direct fire, and surprise attack.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). flank guard. Retrieved September 20, 2026, from http://smartdefine.org/flank_guard/definitions/1961740
ChicagoMilitary Dictionary (DoD). 2011. "flank guard" http://smartdefine.org/flank_guard/definitions/1961740 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, flank guard, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/flank_guard/definitions/1961740>.
MLAMilitary Dictionary (DoD). "flank guard" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/flank_guard/definitions/1961740>