The Explorers Sigil is one of Star Command's highest awards, and is given only to those who have made first contact with an alien species.
Admiral Li Po Yu was awarded the Explorers Sigil for first contact with the Smuilian Confederacy.
In Ques 329AE Captain Ejjina Mexonber-Quad was awarded the Explorers Sigil with Bronze Clusters for making first contact with the Tincarma and Sarafid Dowd'i Kingdom and helping bring an end to the Sarafid Dowd'i-Tincarma War.