Interesting how you change the subject from you seeing US soldiers in these shirts to the existence of them.
Which soldiers have you seen with these shirts? Where, when, what unit, what names? How did you know they were soldiers? Those T shirts aren’t approved uniforms for soldiers to wear. There are also pro-communism t shirts for sale. That doesn’t mean US Soldiers are on record as wearing them on duty.
I think much of the time you are repeating things you think are true because you don’t critically analyze your sources. That’s not making up facts; but it’s still dishonest.
Here’s the source the wiki article you referenced was using:
Doyle, Charles Doyle; Mieder, Wolfgang; Shapiro, Fred R., eds. (2012). The Dictionary of Modern Proverbs. Yale University Press. ISBN 9780300136029. OCLC 759174383.
How do you know Mr Doyle got his info from a reliable source?