NBCNews.com'No medically valid reason' to ban trans troops, American Medical Association saysNBCNews.comThe country's largest association of physicians sent a letter to Defense Secretary Jim Mattis this week opposing the transgender military ban. by Ariel Jao / Apr.05.2018 / 7:23 PM ET. “There is no medically valid reason — including a diagnosis of ...Top medical group says 'no medically valid reason' to ban transgender troopsWTNH.com (press release)all 3 news articles »