!!! Overview[1]
[{$pagename}] of the [United States Federal Executive Department]  whose head is a member of the [United States Cabinet|United States Cabinet Department] within the [United States Executive Branch] of the [United States federal government] charged with coordinating and supervising all agencies and functions of the [United States federal government] concerned directly with [National Security] and the United States Armed Forces. 

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [https://en.wikipedia.org/wiki/United_States_Department_of_Defense|Wikipedia:https://en.wikipedia.org/wiki/United_States_Department_of_Defense|target='_blank'] - based on information obtained 2017-01-10-