What is the meaning of shell (specify)?

shell > specify
(DoD, NATO) A command or request indicating the type of projectile to be used.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). shell (specify). Retrieved September 20, 2026, from http://smartdefine.org/shell_(specify)/definitions/1963952
ChicagoMilitary Dictionary (DoD). 2011. "shell (specify)" http://smartdefine.org/shell_(specify)/definitions/1963952 (accessed September 20, 2026).
HarvardMilitary Dictionary (DoD) 2011, shell (specify), Smart Define, viewed 20 September, 2026, <http://smartdefine.org/shell_(specify)/definitions/1963952>.
MLAMilitary Dictionary (DoD). "shell (specify)" 4 April 2011. Web. 20 September 2026. <http://smartdefine.org/shell_(specify)/definitions/1963952>