Marine One is the helicopter aircraft for the President of the United States.
Marine One landed in London Stansted Airport as U.S President Benjamin Asher, along with Secret Service Director Lynne Jacobs, Mike Banning and other Secret Service agents came aboard after arriving in the airport for the funeral of British Prime Minister James Wilson. Marine One, along with Marine Two and Marine Three, landed in the Somerset House where it was set up as a rendezvous point for the President's motorcade to go to St. Paul's Cathedral. After multiple terrorist attacks in London, Asher, along with Banning and Jacobs, went back to Marine One to return to Stansted Airport where Air Force One was at. After Marine Three was shot down by terrorists using Stinger missiles, Marine One and Marine Two dodged them with flares until they ran out. After Marine Two was taken out, Marine One was finally shot down and it crashed into Hyde Park. Although President Asher and Banning survived, Jacobs was fatally injured in the crash. Jacobs told Banning to stay alive to see his kid born and make the terrorists pay before dying, probably due to internal injury and bleeding. Banning and Asher ran away from the crash site as terrorists on motorcycles were closing in on the scene.
Vice President turned President Allan Trumbull rode Marine One and was accompanied by a Secret Service escort for a fishing trip. When a drone assault occurred, Marine One was destroyed and the entire protection detail, except Mike was killed. A backup Marine One was sent to pick up Trumbull and Mike, who were rendered unconscious in the aftermath.