by Apollo, Space Shuttle, and ISS crews, astronauts will rely on a life-support umbilical used on all Gemini and Skylab flights. As the Orion spacecraft lacks an airlock like that found on the Shuttle and the ISS, all members of the spacecraft crew will be required to be suited up, as the entire cabin would be depressurized (similar to that employed on Gemini and Apollo), thus microgravity EVAs conducted from an Orion spacecraft would only be of an emergency nature. The "Configuration One" system would be capable of supporting an astronaut crew for approximately 120 hours in the event of an emergency cabin depressurization. Manufacturer: Oceaneering International (David Clark Company as subcontractor) Missions: TBA, but ready to fly by 2015. Function: Intra-vehicular activity (IVA) and emergency Orbital Extra-vehicular activity (EVA) Operating Pressure: Primary Life Support: Vehicle Provided Configuration Two The "Configuration Two" suit, was to be used primarily for lunar EVAs conducted during the initial 7- to 10-day lunar sortie missions and later for 3 to 6-month lunar outpost missions, would consist of a completely new spacesuit, similar in appearance to both the Mark III and I-Suits designed and tested by ILC Dover in the early 2000s, but would incorporate the arms, legs, gloves, boot assemblies, and helmet from the "Configuration One" suit. Like the Mark III and the Generation III I-Suit, the "Configuration Two" suit would use a rear-entry hatch design, eliminating the need for the dual-plane closure used on the Shuttle/ISS EMU suits and unlike the current NASA suit, a hybrid of both the Apollo A7L/A7LB suits and the Litton-developed RX-series hard suits, will be of a "soft-suit" design, allowing astronauts to bend over and grasp objects when fully suited and pressurized. New joint designs on the "Configuration Two" suits, along with the soft-suit elements from the "Configuration One" suits, will allow the suits to operate at a higher pressure (around , the pressurization used on the Orlan space suit), eliminating the danger of undergoing decompression sickness normally associated with the lower pressure of the Shuttle/ISS suits (which operates at ). Unlike the orange-colored "Configuration One" suits, the "Configuration Two" suits will have a white cover layer, which will require the use of cover layer "sleeves" on the arms and legs of the "Configuration One" suit. Like the cover layer on the A7L and A7LB suits, the cover layer "sleeves" for the "Configuration Two" suit's "Configuration One" limbs