Serve smiles at Chester County Blood Drives! Blood Drive Donor Ambassadors are needed in Chester County at mobile Blood Drives or at the West Chester Blood Donor Center. In this vital role, you will serve as a greeter to blood donors and be responsible for checking them in, making sure they are registered and observing all established safety protocols and CDC guidelines as well as help out at the refreshment area post blood donation. Training required. Shifts are 4 – 6 hours and you are asked to commit to one to two shifts per month. Help thank those who give the gift of life!