Nicole Victoria "Duke" Aunapu Mann is an American test pilot and NASA astronaut. She is an F/A-18 Hornet pilot and a graduate of the US Naval Academy, Stanford University, and the US Naval Test Pilot School. She has over 2,500 flight hours in 25 types of aircraft and 200 carrier landings, and has flown 47 combat missions in Iraq and Afghanistan. Mann completed astronaut training in 2015 and was assigned in August 2018 to Boe-CFT, the first crewed test flight of the Boeing CST-100 Starliner, but subsequently reassigned to the SpaceX Crew-5, becoming the first female commander of a NASA Commercial Crew Program launch.

Boeing Crew Flight Test (Boe-CFT) will be the first crewed mission of the Boeing Starliner and the third orbital flight test of the Starliner overall after the two uncrewed orbital flight tests, Boe-OFT and Boe-OFT 2 in 2019 and 2022. The flight was scheduled for liftoff at 2:34 on 7 May UTC, but was scrubbed about two hours before liftoff. The cause of the 6 May 2024 mission scrub was due to an oxygen valve problem on the United Launch Alliance's (ULA) Atlas V, and not due to any anomaly on the Starliner portion of the rocket. The launch is now scheduled to occur no earlier than 17 May at 22:16 UTC.