Pilot Signed Photos › Travis Hoover & Tung-Sheng Liu Image 1 of 1 Travis Hoover & Tung-Sheng Liu $135.00 Doolittle Raid Crew # 2 with 2 signature of Pilot Travis Hoover and honary member of Doolittle Raiders Tung-Scheng Liu Add To Cart Added! Doolittle Raid Crew # 2 with 2 signature of Pilot Travis Hoover and honary member of Doolittle Raiders Tung-Scheng Liu