In other words, your 300 1H must light up all the research and development, and also develop all the technology trees, that is, you have to develop 3002DB, and all the lights can be turned on to become an elite tank.
If it is an elite tank, there is an option in the upper left corner of the personnel list, which is the upper left corner of the command. Just check it. However, this kind of accelerated training is so lame that it won't give you a personal experience, and it can only give the members with the lowest proficiency twice the experience, which means that this kind of accelerated training only increases the speed by one fifth-pain.