O- can go into anybody, O+ can go into 80% of the population. In a pinch. It's better to match blood types exactly if possible. Which is tricky if the patient is AB+/-, those are rare blood types and always in strong demand.
https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/blood-groups
Couldn't they have come up with their own slogan and not stolen the women's rights one in the US?