 She spent the next year operating on "detached service", presumably providing repair and support services to submarines up and down the east coast.On 17 July 1920, the Navy adopted the alphanumeric system of hull classification and identification, and "Beaver" was designated AS-5.The tender's only unusual duty came in September, when she assisted the unsuccessful attempt to salvage submarine that had sunk off the Delaware Capes on the 1st.