In this Sept. 7, 2016, photo, Dr. David Klein, chief of adolescent medicine at Fort Belvoir Community Hospital and an Air Force Major, listens to the heartbeat of Jenn Brewer, 13, at her monthly doctors appointment visit for monitoring of her treatment at the Pediatric Clinic at Fort Belvoir Community Hospital in Fort Belvoir, Va. Brewer is transitioning from male to female.
In this Sept. 7, 2016, photo, Dr. David Klein, chief of adolescent medicine at Fort Belvoir Community Hospital and an Air Force Major, listens to the heartbeat of Jenn Brewer, 13, at her monthly doctors appointment visit for monitoring of her treatment at the Pediatric Clinic at Fort Belvoir Community Hospital in Fort Belvoir, Va. Brewer is transitioning from male to female. Jacquelyn Martin AP
In this Sept. 7, 2016, photo, Dr. David Klein, chief of adolescent medicine at Fort Belvoir Community Hospital and an Air Force Major, listens to the heartbeat of Jenn Brewer, 13, at her monthly doctors appointment visit for monitoring of her treatment at the Pediatric Clinic at Fort Belvoir Community Hospital in Fort Belvoir, Va. Brewer is transitioning from male to female. Jacquelyn Martin AP

Republicans fail in last-ditch push to ban medical treatments for transgender troops

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    Learn about the brain reward system and the biochemical processes that occur during methamphetamine use.