It is strictly forbidden for military personnel to engage in commercial activities and collect fees for suspected business. Why should the country pay you back? Invite military commentator Zhang to comment for free, all for free. Professors in other national defense universities, such as Fang Bing and Ma Jun, are free of charge, which is the obligation to popularize military knowledge to the whole people. They are called consultants. Zhang is a consultant for me, and it's free. He doesn't even come to dinner. A friend of mine is a teacher, and it's free to go out and speak. It must be a fake soldier who collects money!