According to my personal experience, I think the technology you put forward here should include two aspects. One is the military expertise, such as the maintenance of special vehicles and equipment, military communications, etc. If you choose to learn these skills, you must make plans and preparations for long-term service in the army. Although these techniques may be helpful for returning to work in the local area in the future, they are too "professional" and may not be helpful for your future work.

On the other hand, it is civilian technology. This can also be said to be a kind of welfare given by the army to the upcoming veterans. You can choose according to your hobbies, such as driving, cooking, computer and so on. But usually this kind of training time is not long, so after the training, the level of qualification certificate you can get will not be too high. It's just that the army will give you "a skill" according to your requirements, and it will be easier to find and adapt to a new job after recovery.

Thirdly, speaking of being a flight attendant, I personally feel pretty good. Although the company's work scope belongs to logistics and the work content is "miscellaneous", it will not be too hard and the salary will be ok. Of course, if you have the opportunity to enter a civilian post in the army, it may be more beneficial to your future promotion. Ha ha! ~~