UPS announced to its workers that they will be mandating the COVID-19 vaccine for employees insert and US locations. In their statement they said that “UPSers must be vaccinated when they return to the office.” they say that this mandate for office employees is because the office environment is different from their operating facilities that have been safely staffed in person during the pandemic. UPS’s rival, FedEx, has not yet made vaccinations required but strongly encourages employees to get them.
See "UPS releases their vaccine mandate ", Kannaki Deka, Reuters, August 24, 2021