Yes of course,if they can be stabilize ans slowly learn how to control it with eitheir less or no drugs at all(for emerginces) they should be able too!
Some people that are diagnosed with ADHD or ADD do not take the recommended course of treatment, and therefore might be requested not to be in the military. However, if someone diagnosed with ADHD or ADD takes the recommended course of treatment, and this doesn't impair their work in a significant way as measured by military staff, then it should be fine for them to work in a military setting.
