design for Block II was to be selected in a June 1965 re-competition. To assure Block II backpack success, AiResearch was funded for a parallel backpack effort. The later, longer-duration Apollo missions would be Block III and have more advanced pressure suits and a longer duration backpack to be provided by suppliers selected in future competitions. To reflect this new start in the program, the PGA was renamed the Pressure Suit Assembly (PSA) across the programs and the Block II and III SSAs were renamed Extravehicular Mobility Unit (EMU). Hamilton and International Latex were never able to form an effective working relationship. In March 1965, Hamilton switched to B. F. Goodrich as suit supplier. International Latex, in July 1965, won the Block II suit competition with its A5L design. This forced NASA to assume management of the Block II EMU program directly. Before the end of 1965, Hamilton Standard completed certification of its new backpack. NASA subsequently terminated the Block II AiResearch backpack, thus completing the selection of the suit/backpack designs and suppliers to support man's first walking on the Moon. However, this was not to be without improvements. The Apollo 11 EMU featured an A7L suit with a -6 (dash six) backpack reflecting seven suit and six backpack design iterations. The A7L was a rear entry suit made in two versions. The Extra-vehicular (EV), which would be used on the Moon and the Command Module Pilot (CMP) that was a simpler garment. The A7L pressure suits reached space flight in October 1968 aboard Apollo 7. These were used as launch and reentry emergency suits. Also in 1968, NASA recognized that with modifications, the Block II EMU could additionally support the later EVA missions that involved a Lunar Rover Vehicle (LRV). This resulted in the termination of Apollo Block III in favor of an Apollo 15 through 17 EMU using an A7LB suit and a "-7" long duration backpack. The complete Apollo EMU made its space debut with Apollo 9 launched into space on March 3, 1969. On the fourth day of the mission, Lunar Module Pilot Russell Schweickart and Commander James McDivitt went into the Lunar Module. The astronauts then depressurized both the Command and Lunar Modules. Schweickart emerged from the Lunar Module to test the backpack and conduct experiments. David Scott partially emerged from the Command Module's hatch supported by an umbilical system connected to the Command Module