Does the flag on top of the shirt on the back of Kaiji Ito, the protagonist of Gambit Mime, have any meaning?

Originally a U.S. military tradition, commemorating World War II combat operations in the Far East in Japan, Korea, the Republic of China and other war zones, and Tom's jacket is a meaning of ambition, of course, active military personnel can not be posted on the uniform of these. Later on, it became some kind of civilian fashion, just like some people like to wear camouflage