The creators of Arc Raiders recently decided to congratulate the community and sent out letters, as well as prepared a small gift:
Today, the residents of Speranza honor their loyal companions who are always there to support them in times of trouble — and so do we. Celebrate this holiday with a gift from us, "Strength in Unity" — the emblem of Speranza, a symbol of common resistance.
After logging into Arc Raiders, the gift must be collected from the letter in the in-game mail. The "Strength in Unity" keychain will be available in the "Backpack Charms" customization tab.