Jerne City H.Q. functioned as a military installation for the Imperial forces, situated on the planet Jerne. During the era of the Galactic Civil War, this base was overseen by Captain Ryko Vant. Notably, the Sith Lord Darth Vader once made a visit to Jerne City H.Q. as part of his mission to locate the Rebel leaders, namely Luke Skywalker and Leia Organa.