Operations Security (OPSEC): Security measures that prevent the enemy from collecting or analyzing information that may be useful to it.

CENTERFORSECURITYPOLICY: What is IW?

The uproar circles around an Army regulation issued April 19 which updates earlier language about operational security (or "OPSEC") and blogs.

NPR: U.S. Army May Restrict Soldiers' Blogs

Related and supporting capabilities include computer network operations, electronic warfare, deception, operations security (OPSEC), intelligence, perception management, psychological operations (PSYOPs), and public affairs.

FORBES: DOD Cyberspace Strategy is Too Narrow, Too Negative

The Wall Street Journal learned of the documents from a person involved in the U.S. investigation and asked OpSec to make them available for review.

WSJ: How Fake Avastin Penetrated U.S. Doctors' Offices

The documents were obtained last year from an unsecured Canada Drugs-controlled website by OpSec Security, a Denver-headquartered firm hired by pharmaceutical companies to monitor potential counterfeiters and illegal importers.

WSJ: How Fake Avastin Penetrated U.S. Doctors' Offices

Unwavering discipline is demanded by OPSEC, and in this final duty to maintain OPSEC by submitting to the review he swore, in writing, to submit to, Bissonnette clearly failed.

FORBES: Does Matt Bissonnette's "No Easy Day" Take the Easy Way Out?