ボストーク
The Vanguard Six were given the title of pilot-cosmonaut in January 1961 and entered a two-day examination conducted by a special interdepartmental commission led by Lieutenant-General Nikolai Kamanin, the overseer of the Vostok programme. The commission was tasked with ranking the candidates based on their mission readiness for the first human Vostok mission. On 17 January, they were tested in a simulator at the M. M. Gromov Flight-Research Institute on a full-size mockup of the Vostok capsule. Gagarin, Nikolayev, Popovich, and Titov all received excellent marks on the first day of testing in which they were required to describe the various phases of the mission followed by questions from the commission. On the second day, they were given a written examination following which the special commission ranked Gagarin as the best candidate for the first mission. He and the next two highest-ranked cosmonauts, Titov and Nelyubov, were sent to Tyuratam for final preparations. Gagarin and Titov were selected to train in the flight-ready spacecraft on 7 April. Historian Asif Azam Siddiqi writes of the final selection: