Previous FT threads about it

http://www.flyertalk.com/forum/air-c...bravo-sea.html

From the top ten codes you are not supposed to know over at listverse.com

Code Bravo is the code phrase for a general security alert at airports. Unlike most of the codes on this list, the code is meant to cause alarm – but not through knowing what it means: when this alert is raised, all of the security agents will begin to yell “Code Bravo” in order to frighten the passengers – this is supposed to make it easier for the agents to locate the source of the problem without interference from the general public. For those of you who travel on ships from time to time, you may like to know that Code Bravo means “fire” and it is the most serious alert on a ship – if it burns, you either get off or burn with it. Ships also often use sound signals, such as 7 short and 1 long, meaning “man the lifeboats”.

A video of Billy Crystal from TMZ going through Security when they bark out a Code Bravo

http://www.tmz.com/2008/07/11/billy-...eld-up-at-lax/

One guy who worked for the TSA has this on his resume

Authored DFW Airport's emergency security response procedures; Code Bravo is the screening checkpoint breach containment procedure and Code Tango is the Improvised Explosive Device (IED) escalation procedure. The successful documentation and implementation reflects detailed security knowledge that was acquired working as a lead, supervisor and security manager.