I never knew someone could be dismissed from the Coast Guard, then sign up for the Army. Seems there should be a way to prevent people like him from joining after the first attempt in another service.
When my son enlisted he had to provide a letter from his Navy ROTC chain saying he had good service. Although he was applying for a competitive MOS.
You have to admit on the entry paperwork that there was an episode, and cite the discharge. If there’s questions....the Army has to write a waiver. I suspect....there’s a waiver there, but the Army not grasp that he showed psychological signs of some type during the coast guard episode. Not to suggest such, but there might be a hundred Bergdahls in the Army today.