Checkpoint Gamma, a military installation of the Galactic Empire, was established in Ahdjok, which served as the capital of Nizon.
During the Battle of Nizon, Imperial forces constructed this checkpoint spanning a major thoroughfare. The checkpoint incorporated a pair of ferroconcrete barricades, each measuring 1.5 meter in height, separated by a guarded opening. This obstacle presented a significant challenge to the Nizon resistance, effectively severing the connection between their two primary factions. Seeking to assist in overcoming this impediment, a squad of operatives from the Alderaanian Resistance launched an assault on the checkpoint, which was defended by three AT-RTs.