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 {|cellspacing=10 cellpadding="15" width="100%" border="0" the name would cause confusion because Zarya was the code name for the TsUP. The station was hurriedly renamed Salyut (“salute”) 1 (figure 2-3). A three-stage Proton rocket boosted Salyut 1 into orbit (figure 2-4). The Soyuz 11 crew, which occupied Salyut 1 in June 1971, perished during return to Earth due to a Soyuz fault. Salyut 1 was followed by three more firstgeneration DOS-type stations, all based on Almaz components: one which failed to reach orbit in 1972 and received no official public designation (DOS-2), Cosmos 557 (DOS-3), which failed in orbit in 1973, and Salyut 4 (DOS-4) in 1974.
 * align="top" align="left" rowspan="1" colspan="2" | [[Image:Mir-35.jpg|550px|center]] Figure 2-3. Salyut 1. Visible at the rear of the station (left) is the Soyuz-based propulsion module. A Salyut 1 Soyuz prepares to dock at the front of the station (right). Note the station’s Soyuz-type solar arrays.
 * width="33.3%" valign="top" align="left" rowspan="2" colspan="1"| [[Image:Mir-36.jpg|175px|center]] Figure 2-4. Partial cutaway of Proton configured for space station launch. The three-stage Proton rocket has launched all Soviet space stations and space station modules. Proton first flew as a two-stage vehicle in 1965. The threestage version used to launch stations debuted in 1969 and was declared operational in 1970. All three stages burn UDMH and N2O4 propellants. The three-stage Proton can place 20,000 kg in a circular 185 km orbit at 51.6° of inclination.
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The first-generation stations could not be refueled, and resupply was limited to what could be carried in the Soyuz orbital module. The firstgeneration stations each had only a single docking port.
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2.1.4 Almaz: Cancellation (1970-1980)
The Almaz program continued in modified (abbreviated) form. TKS work continued, though Soyuz spacecraft were used to ferry cosmonauts to the Almaz stations. Salyut 2, Salyut 3, and Salyut 5 were the Almaz 1, Almaz 2, and Almaz 3 stations. Salyut 2/Almaz 1 failed in orbit shortly after launch. NPO Mashinostroyeniye prepared Almaz 4 for launch in 1978, and proposed a 35-ton multiport Almaz station. Launching the Almaz multiport station would have required a new launch vehicle. However, the Almaz program was cancelled shortly before Almaz 4 (it would have been Salyut 7) was set to launch. The Almaz hardware was put in storage. Manned spaceflight activities became concentrated at NPO Energia in 1980. Energia worked with KB Salyut to produce additional Salyut stations.
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