Not necessarily, but you couldn't join any branch of the armed forces if you suffered from any of the following:

• Ongoing psychiatric illness
• Psychosis
• Schizophrenia
• Obsessive-compulsive disorder
• Autism
• Personality disorder
• More than one episode of deliberate self-harm of any type
• Post-traumatic stress disorder (PTSD)
• Alcohol, drug or substance dependence
• Attention deficit hyperactivity disorder (ADHD) unless free of symptoms and not requiring treatment for at least three years.
• Anorexia or bulimia

[Source: Armed Forces Careers Office Form 5, January 2009]

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