ground, one in Europe and one at NASA's Ames Research Center. New oxygen generation system This device is considered a test for an equipment design with potential for use on proposed future long durations to the Moon and Mars. The system will initially run below its maximum capacity, though it is designed for enabling the ISS to support a crew of six in the future. It will supplement the Russian-built Elektron system operating in the Zvezda module. New cycling machine for the ISS crew A Danish built device, the Cycle Ergometer with Vibration Isolation System (CEVIS) Replacement common cabin air assembly heat exchanger used to control the internal air temperature of the ISS. All of the above equipment was installed in the Destiny Laboratory Module. Also carried in the payload bay was an Integrated Cargo Carrier with the Trailing Umbilical System (TUS) for the Mobile Transporter (returning old one), an EATCS/Pump Module (PM), two Fixed Grapple Bars for PM and TUS relocation during EVA and an LMC carrying the DTO-848 TPS Repair Box. Mission timeline The shuttle was docked to the ISS for the majority of the flight. For much of the time the shuttle was at the ISS the Multi-Purpose Logistics Module Leonardo was mated and accessible to the crew for the transfer of equipment, supplies, returned experiments and trash. Three spacewalks were carried out on the mission, the third was dependent on sufficient consumables being available and two alternate timelines were planned, with and without the final spacewalk. There were also additional "Get Ahead" tasks planned for the crew to do at the ISS if they found themselves with more time than planned, one such get ahead task was completed on EVA 2. The crew were able to take the majority of one day off, during which they explored the ISS, took photographs, and conducted press interviews. Events throughout the day went according to plan, one exception being an abnormal temperature reading on thruster L5L (see Pre-launch concerns). The launch window was from 3:48:41 to 3:53:02 pm at 3:42, while in the T-9 built-in hold, mission control decided to postpone launch because anvil (thunderstorm) clouds and lightning were detected within of the launch area and path. Launch was rescheduled for July 2 at 15:26. STS-121 was the first launch during which NASA took special precautions to deter vultures, particularly the local turkey vulture, from flying over the area.