The security constraints are one reason why this intelligent and articulate woman rarely appears in public .

BBC: Zinat Karzai, Afghanistan's 'invisible' first lady

We thoroughly reviewed all the records for that time period to be certain we could give you the fullest details possible within the constraints of operational security.

NPR: Guantanamo Detainees Attempted Mass Suicide in 2003

One of the greatest constraints to adding additional security features is the very limited amount of battery power available.

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Senator McCain noted that budget constraints had actually forced the Transportation Security Administration - formed after the 11 September attacks - to cut the number of screeners working at airports.

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They understood that there are instances when the gains in security from government action are not worth the added constraints on our freedom.

CNN: Obama offers health care details in speech to Congress

The balance between revising national defence and security strategy ( or lack thereof) and budget constraints will be picked over for a long time once the SDSR is published, which may be at the end of October.

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The recent ruling by a U.S. District Court judge that sonar training off of the West Coast was not a national security issue, but rather an environmental issue subject to the constraints of federal environmental statutes, illustrates the reality of this risk.

CENTERFORSECURITYPOLICY: Sirens in the Strait