An AIDS ribbon is a red ribbon worn to signify support for AIDS awareness and treatment.
Red is AIDS ribbon color.
The Red Ribbon Project was created in 1991 by VISUAL AIDS Artists Caucus in New York. The Red Ribbon is a symbol designed to promote the fight of AIDS.
the red ribbon is a logo for the AIDS and HIV foundation/ organization
"Red Ribbon week is for remembering people who have AIDS or HIV. You can celebrate this week by making a quilt for people with aids and selling it, and then donating the proceeds to aids charity."
Red
It stands in support of those who have HIV/AIDS
the black ribbon is in support of melanoma cancer patients.
Red Ribbon Club is a movement started by the Government of India in Schools through which students will be making awareness of AIDS.
Red
Red
http://www.schemamag.ca/archive2/images/347px-World_Aids_Day_Ribbon.png
If you mean red ribbon as related to Aids Awareness then Witnesses try to take no part in anything viewed as a political, religious or social protest or solidarity with similar positions.