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which were among the rocket's first payloads

The Alfa class submarine was a nuclear powered high velocity submarine in service with the Sovet Navy and then the Russian Navy

but the project was later cancelled

-Soviet joint space venture

Black / Steel Automatic BUCKLE: Fold Over Buckle withUser Manual: EN The first Proton rocket was launched in 1965. Modern versions of the launch system are still in use as of 2021, making it one of the most successful heavy boosters in the history of spaceflight. As with many Soviet rockets, the names of recurring payloads became associated with the launch vehicle itself. The moniker "Proton" originates from a series of similarly named scientific satellites, which were among the rocket's first payloads.