My knowledge of the history of Herlong is rather slim. On the other hand I know the history of its predecessors, such as Honey Lake City, Cromwell, Rayl and Hackstaff. If anyone has stories of Herlong they would like to share, by all means you are welcome.
Herlong came into existence on February 5, 1942, when General George Catlett Marshall, Chief of Staff, signed War Department General Order No. 9 that established the Sierra Ordnance Depot. Construction of the Depot began the following month. The community there was named for Captain Henry W. Herlong, the first Ordnance Officer killed in World War II. On November 18, 1942, the Herlong Post Office was established.
Jo Iland put together a good history of the early days of the construction of Herlong. It was published in bulletin No. 16 of the Lassen County Historical Society in 1966. However, I have no idea if it is still available.