Sigma group
Sigma group was a standard designation for Delta-class DX-9 stormtrooper transports found aboard Imperial warships or space stations.
A typical duty for these craft was disabling and boarding enemy craft, such as the BFF-1 bulk freighter Onece, or heavy rocket attack such as the assault on the Rebel cruiser Lulsla.
Another standard designation for Imperial DX-9s was Omega.
