In 1965, internal fighting between Vladimir Chelomey and Sergei Korolev over control of the Soviet manned circumlunar flight program will cause the Soyuz Program to split into two branches. There will be an earth-orbital version of the Soyuz known as the Soyuz 7K-OK and a revised circumlunar flight version known as the Soyuz 7K-L1. Photos: https://www.spaceracehistorypodcast.com/post/episode-38-soyuz-reprogrammed