The scenario for a war game organised in the US in March 2017 envisaged that "an armed group has come ashore on one of the Senkaku Islands in Okinawa Prefecture, and while the Japan Coast Guard and police forces struggle to bring the incident under control, China indicates it will intervene and dispatches a military vessel to waters around the island." This war game involving about 20 participants — including former high-ranking government officials from Japan and the United States, and former SDF members. The participants were split into three teams representing the governments of Japan, the United States and China, and conducted a table-top exercise to gauge what steps each likely would take. Participants recreated and examined two major cases, and delved into problems that might emerge in handling them. Organized by the Sasakawa Peace Foundation USA, a research institute in Washington, the event was held at an exclusive facility of major U.S. aircraft manufacturer Lockheed Martin Corp. in Suffolk, Va. The Yomiuri Shimbun was granted special permission to cover the event. The China team was played by U.S. participants, including Dennis Wilder, a former National Security Council senior director for Asian affairs.