Dozens turned out throughout the day to donate.
One Red Cross volunteer said causes like this really hit home for him.
Greg Ireland had been working as a firefighter in Holden for only a few months at the time.
Ireland was at the fire station when he and his fellow first responders got the news of the terrorist attacks.
"I remember thinking to myself, 'Oh, it was a Cessna,' something small or like that. And we turned it on and saw the whole thing live as it was happening," he said.
"So the reason why we do what we do is very important to me," he said.
Those who missed Tuesday's blood drive can sign up to donate any time at the donor center on Hammond Street in Bangor or by visiting redcrossblood.org.