The 91st Reconnaissance Corps was a division of the Grand Army of the Republic during the Clone Wars. Comprised of clone troopers and BARC troopers, the 91st Reconnaissance Corps was led by Commander Neyo. The identifying marks of the 91st were small red circles with a white sword pointing upside down running across them. To protect their commander, 91st's lieutenants wore, like Neyo, a specialized helmet very similar to those of clone assassins that gave them a more sinister look.
Commander Neyo's troops were part of the multi-battalion taskforce led by High General Oppo Rancisis on Saleucami during the Outer Rim Sieges. Elements of the 91st Reconnaissance Corps fought in the ensuing battle, and remained planetside in the aftermath to scout out remaining pockets of Separatist or Morgukai resistance.
Commander Neyo and his Recon Corps were led by Jedi Master Stass Allie during their patrols of the Saleucami plains. After receiving Order 66 from Emperor Palpatine, Neyo and his men turned on their Jedi General. Neyo and his wingman opened fire on Allie's speeder bike, killing her in the resulting explosion.