The final component of the Canadarm is the Mobile Base System (MBS), which was installed on board the station during the STS-111 flight.Remaining objectives included the transfer of other equipment to the station such as an Ultra-High Frequency communications antenna and a spare electronics component to be attached to the exterior during space walks.[4] Hadfield experienced severe eye irritation during the spacewalk due to the anti-fog solution used to polish his spacesuit visor, temporarily blinding him and forcing him to vent oxygen into space.[4] NASA began a tradition of playing music to astronauts during the Gemini program, which was first used to wake up a flight crew during Apollo 15.[6][7] This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.