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If you are talking about obtaining disability from the military, then no that section won't specifically help you. That article is referring to a regulation that allows separation of a member based on a pre-existing condition.
Now, you can certainly use that section to demonstrate that there was a medical issue at play, but you will need some other evidence to disprove the idea that the condition was pre-existing, because a pre-existing condition separation is given as a basis when the military makes the determination that your condition was not caused by military service.
Again, they could absolutely have been wrong and it is something you can challenge, but you need to know that going there. If you tried to rely solely on that separation description, you'd automatically lose unless your position is that your pre-existing condition was aggravated or made worse by military service. Then you'd need some evidence supporting that position too.
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