At Corregidor, U.S. forces sent up false smoke rings when their batteries were in action in order to confuse the enemy as to the true location of their artillery.
Here's what the look like when they're born.
Sounds like Baghdad Bob himself :)
http://www.jihadunspun.com/intheatre_internal.php?article=100422&list=/home.php&
Thank you for the deatailed response.
It's very educational.