First of all, it depends on which unit you go to. If you are only a first-line field regiment, you can basically go directly to the car company as a soldier, but I tell you, no one in the car company took the driver's license because no one checked the driver's license of the army. You can drive without photos.
The driver's license is issued to the division training brigade (directly under the corps level). You can only take the exam there, but it won't be given to you. You can also get someone to help you get one, but I tell you, basically 100% is fake, the license plate is real, but the number is fake, because the local and military driver's licenses after 2007 can be found online, so it can't be changed.
Conclusion: The probability of getting a B-photo in the army is smaller than that of entering a car company. It's only possible if you drive for someone above the organizational level.