Defcon Three Alert Level. Round House Or Condition Color Yellow
What Is Defcon Level Three Or "Round House"?Defcon three, also called "Round House" is yellow in color and is an increase in alertness and readiness. With level 3 the air force is in a state of readiness so that they can deploy and mobilize within 15 minutes time.
The meaning behind three is similar to that of a yellow "Caution" sign. We are prepared, cautious and in a state of military readiness.