If you're looking for the military term that SecDef stands for, you've come to the right place. Here on acronym.io, we define the meanings of all kinds of acronyms, abbreviations and initialisms, including those relating to military such as SecDef. On this page you will find the SecDef meaning, what SecDef stands for, and possibly some other relevant information.
SecDef Meaning
SecDef means Secretary of Defense
In military, SecDef means Secretary of Defense.
The meaning of SecDef is Secretary of Defense.
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