A few nice National Security images I found:

Equipment waiting to be loaded

Image by NNSANews
Equipment waiting to be loaded on an Air Force C-17 shortly after it landed at Nellis Air Force Base in Las Vegas Monday afternoon. Highly trained nuclear emergency response personnel and more than 17,000 lbs of hi-tech equipment are being sent to Japan as part of the Department of Energy and National Nuclear Security Administration’s effort to assist Japanese personnel with nuclear issues.

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National Security Industrial Association Visit : Consolidated/Convair Aircraft Factory San Diego

Image by San Diego Air & Space Museum Archives
Call No.: 10-000796
Notes: National Security Industrial Association Visit
Title: Consolidated/Convair Aircraft Factory San Diego
Year: 1958
Corp. Name: Convair/Consolidated
Description: 8 x 10 Black and White Glossy Print
Repository: San Diego Air and Space Museum Archive

Afghan National Security Forces

Image by isafmedia
100616-A-0350A-142 Afghan National Security Forces and International Security Assistance Forces search for weapons during Operation Demon Sang in Mata Khan District, Paktika Province, Afghanistan, June 16. The purpose of Demon Sang is to minimize enemy capabilities and influence in the Mata Khan District by assisting the Afghan National Security Forces in clearing and searching for weapons. (Photo by Sgt. Jeffrey Alexander)