Lieutenant Colonel Michael Sokolov was the Payload Specialist for mission 'MME-1667.' Before his death, he mentions that he is too badly injured after having took "too many risks" to be healed and needs treatment from a medical facility (the closest of which are on Earth at the time of the recording). Given that 'MME' likely stands for 'Manned Mars Exploration,' and the implication that Mars is barren, Lt. Col. Sokolov was likely part of a group of astronauts who were among some of the earliest explorers of Mars.
The insignia on his ID card does not belong to the Ultor Corporation or the Earth Defense Force, implying that the original manned Mars missions were conducted by another group prior to 2050, likely a government organization or space agency.