"Obviously, it will be a historic artifact of tomorrow so I won’t be consuming it," said the mayor of Northampton, who became one of the first customers.
The officers' baby boys and girls ranged in age from eight days to six months old.
Juan Lopez allegedly killed a woman doctor he had been involved with, then gunned down a police officer and a pharmacy assistant.
"I am in awe of these children," Tutu said at the ceremony on Tuesday.
Most Americans who could benefit from PrEP still aren't getting it, the CDC says.