The two uncrewed missions immediately preceding the first human flight used the same spacecraft design as in the crewed missions, a design called "Vostok 3KA" (or "3A"). The only differences were that they would carry a single dog into orbit, a life-size mannequin would be strapped into the main ejection seat, and (unlike the crewed missions) they had a self-destruct system. The recent failures of Vostok 1K were not encouraging, but it was decided to proceed with launches of an automated variant of "Vostok 3KA", the spacecraft design that would conduct a human spaceflight. The approval of a crewed mission was contingent upon the success of the two automated "Vostok 3KA" missions. Unlike the previous "Vostok 1K" flights, the two uncrewed "Vostok 3KA" flights were planned to last only a single orbit, to imitate the plan for the first human flight.