What is the meaning of HD?

(Military) HD stands for one of the following: a mustard agent; harmonic distortion; homeland defense
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). hd. Retrieved September 23, 2026, from http://smartdefine.org/hd/definitions/1956013
ChicagoMilitary Dictionary (DoD). 2011. "hd" http://smartdefine.org/hd/definitions/1956013 (accessed September 23, 2026).
HarvardMilitary Dictionary (DoD) 2011, hd, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/hd/definitions/1956013>.
MLAMilitary Dictionary (DoD). "hd" 4 April 2011. Web. 23 September 2026. <http://smartdefine.org/hd/definitions/1956013>