This 80sTees.com exclusive youth GI Joe shirt shows the catchphrase that came from the classic animated series, "Knowing Is Half The Battle". From 1985 to 1987, the animated series GI Joe showed 35 public service announcements, each with GI Joe characters saving kids from dangerous activities. Each PSA ended with a troubled kid saying, "Now I know". The featured Joe would then follow it up with the famous catch-phrase, "And knowing is half the battle!"