Name for Group of Unsung Heroes

We are looking for a brand name that captures the concept of someone being an unsung hero-someone who does good in the world with little to no recognition and without anyone knowing. These people do not seek accolades, but perform good deeds out of the kindness of their hearts. This is a name of us to call this group of individuals. We are a nonprofit organization called Karma for Cara, which focuses on engaging kids in volunteering and recognizing unsung heroes. We are looking to better brand that recognition.