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Military psychology is a specialist discipline within applied psychology. It entails the application of psychological science to military operations, systems and personnel. The specialty was formally founded during World War I in the UK and the USA, and it was integral to many early concepts and interventions for psychological and neuropsychological trauma. It also established a fundamental basis for the psychological assessment and selection of military personnel. During and after World War II, military psychology continued to make significant contributions to aviation psychology, cognitive testing, rehabilitation psychology and many models of psychotherapy. Military psychology now consists of several subspecialties, including clinical, research and occupational psychology, with the latter often referred to in the USA as industrial/organisational psychology. This article will provide an overview of the origins, history and current composition of military psychology in the UK, with select international illustrations also being offered., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: to measure the perceptions of military staff of the impact of wearing military uniform on the therapeutic relationship with mental health clients., Method: a brief questionnaire was distributed to all military clinicians in Departments of Community Mental Health to measure their attitudes., Results: there was a 67.9% (n=70) response rate regarding the impact of uniform on the therapeutic relationship. 20% of responses were positive, 31% negative, 37% mixed and 12% gave no answer., Conclusion: there was no clear pre-existing literature on this issue. Overall, the wearing of uniform appeared to be perceived positively positive. There is a need to assess clients' points of view in future studies.

Questionnaires were completed by military personnel on arrival (n=1,696) in Kabul, Afghanistan and then again on departure (n=1,134). Analysis of the 113 personnel who completed both the arrivals and departures questionnaire revealed a lower alcohol use score after deployment (AUDIT mean difference (post-deployment - pre-deployment) = -0.39, 95% confidence interval (CI) = - 1.25 - +0.47) and no significant change to mental health (GHQ mean difference = 0.55, 95% CI = -0.07 - +1.17). An increase in psychosomatic symptoms (GHQ A mean difference = 0.22, 95% CI = -0.03 - +0.47) is considered to result from the adverse conditions, but it is not supported by other mental ill health markers. In conclusion, there appeared to be no negative effect on mental health from deployment to Afghanistan.