The Asuka Langley Soryu replaced the Neptune class amphibious assault ship HMS Ashford as the Langley Navy's fleet flagship. Both ships are permanently assigned to the Combined Expeditionary Fleet, comprising them and numerous other vessels (two helicopter carriers, two LPDs, two battlecruisers, fourteen frigates, four submarines, and four auxiliaries). Asuka Langley Soryu has most notably participated in the 2017 Misterian Communist revolution, where it and the rest of the CEF assisted in evacuation and humanitarian relief efforts.