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Do a search for "Candy Stripe" and you will find many examples and explanations.
The name came from the slang name for hospital volunteers, young ladies who wore red striped dresses.
They were called "Candy Stripers" (NOT "Candy Strippers!" ) because they wore the distinctive red striped
dress so they were not confused with real nurses.
Non-qualified soldiers assigned to a Special Forces unit wore the stripe instead of the "Full Flash,"
which was reserved for the fully trained and qualified soldiers.
If the soldier was assigned to the 7th Group, the stripe was solid red,
lending an even more direct reference to a "Candy Stripe."
Also known as "Striker Bar" from the resemblance to the "striker" on the side of a box of matches, but officially
called a "Recognition Bar" in the Army Regulations.