The 21st Recon Group functioned as a wing of Recon-X starfighters that was part of the New Republic Fifth Fleet. Lieutenant Rone Taggar was in command of the 21st Recon Group, which was established not long before the Battle of Doornik-319. However, Taggar had previously worked alongside some of the 21st's pilots prior to the unit's official creation.
Following the Battle of Doornik-319, these Recon-Xs were sent out to perform reconnaissance of the Yevethan planets in order to evaluate the Yevethan fleet, also called the Black Fleet. Upon exiting hyperspace near their designated planets, the Yevetha forces either destroyed or captured every Recon-X before it could finish more than 75% of its scan.
Rone Taggar flew the Recon-X named Jennie Lee, which met its end when it was destroyed.