How to abbreviate Passive Defense?

The ways to abbreviate Passive Defense.

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PD:
Passive Defense(Military)
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APASmart Define. (2017). passive defense. Retrieved September 20, 2026, from http://smartdefine.org/passive_defense/abbreviations/a
ChicagoSmart Define. 2017. "passive defense" http://smartdefine.org/passive_defense/abbreviations/a (accessed September 20, 2026).
HarvardSmart Define 2017, passive defense, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/passive_defense/abbreviations/a>.
MLASmart Define. "passive defense" 23 September 2017. Web. 20 September 2026. <http://smartdefine.org/passive_defense/abbreviations/a>