I've know this for quite some time, having been told by a LEO at a young age. If you have seen the Sercret Service agents on TV or in pictures with the President or the presidential candidates you may or may not have noticed this. Secret Service agents and most LEOs are trainined to keep their hands in front of them at the ready position so that they can grab an attacker or block a punch or other attack or to quickly open their jacket to draw their firearm.
The article doesn't really say much. I mean how much more can you really say about keeping your hands up at the ready. I thought the pictures were really great though. Especially towards the bottom when it shows the Secret Service agents outside of the country openly carrying full auto rifles.
http://cryptome.org/usss-hands/usss-hands.htm

__________________
How're we gonna shoot golf without guns?
"It's 2am, do you know where your firearms are?" - In honor of Dennis Farina
When the Boogeyman goes to bed, he checks his closet for Chuck Norris.
If guns cause crime, all of mine are defective.