The Indian Air Force has shortlisted 12 potential astronauts for India’s first manned space mission , the Gaganyaan project. Of them, seven pilots have been sent to Russia for training, the PTI quoted an IAF officer as saying.The officer, speaking on condition of anonymity, told PTI that the rest of the selected people would be sent once the batch of seven returns from Russia."As many as 12 have been selected for the Gaganyaan project in the first level. This is a screening process. Of these, four will be finally selected," the officer said."At the time of the launch of the project, one or two 'Gagan Yatris' will be selected for the Mission," he added.Gaganyaan is India's manned space mission which the ISRO aims to launch by December 2021. The project aims at sending the astronautsto a lower orbit of the earth and the spacecraft will have a capsule with adequate supply of oxygen and other essential material and facilities for the Gagan Yatris, the officer explained.The space agency is working in tandem with the IAF for the mission.According to the officer, initially the cut-off age for the project was 30 but as the IAF pilots of that age group could not clear the test, the age bar was raised to 41.Butola said the aero medical consultancy of crew module design, life support system, onboard health monitoring system and flight support system are yet to be accomplished."Some of the most advanced countries in the world have attempted human space programme and in the face of challenges they had to abandon it because they could not succeed," he explained.The ambitious Gaganyaan mission was announced by the Prime Minister Narendra Modi during his Independence Day speech in 2018.Chief of Air Staff, Air Chief Marshal R K S Bhadauria, on Thursday said the screening process for the selection of crew for ISRO's proposed humanspace flight programme-Gaganyaan-is being done professionally."The screening process is well underway and I thinkit is being done very professionally. And increasingly, the interaction with ISRO is leading to greater understanding of the screening itself," he said.The Air Chief Marshal was speaking at the inaugural session of the three-day 58th Indian annual conference of the Indian Society for Aerospace Medicine (ISAM) here.Speaking about the role of IAF, Bhadauria said theteam coordinating with the Indian Space Research Organisation can look into the design aspect of the spacecraft such as the life support system, thedesign of the capsule and the contribution of this aviationmedicine division to make sure ISRO achieves the challenge it has taken up.Addressing the gathering, Air Marshal M S Butola, director-general medical services (Air), said "The first level of the Gagan Yatri (astronauts) selection process and selection of IAF crew to undergo final astronaut selection and training in Russia is completed."He said the task assigned to them has been completed well in time.