DEFCON US defense readiness condition alert light meter. he Defense Readiness condition alert system has a white, red, yellow, green, and blue light to show the state of the US military and armed forces situation meter on an national scale. Great tee for pop culture lovers and military & war history buffs. Awesome birthday present & holiday idea for a mom, dad, sister, brother, aunt, uncle, boss, or best friend who is a military veteran, gamer, into role playing & computer games. Wear this to a party, school, a comic or science fiction movie convention hacker convention, work or the gym to start conversation and get a laugh. Great item for fans of science fiction action movies, crime thrillers, horror and other pop culture and 80s and 90s movies, and vintage graphic tees! Printed on a 64000 soft style tee. Check size chart to ensure the right fit. • 100% ring-spun cotton • 4.5 oz • Pre-shrunk