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Trial Registration: The authors confirm that all ongoing and related trials for this intervention are registered. The studies reported in this manuscript are registered as clinical trials at ISRCTN: Pilot ID- ISRCTN15325073 RCT ID- ISRCTN59395217., Competing Interests: I have read the journal’s policy and the authors of this manuscript have the following competing interests: Following the results of the studies reported in this manuscript (and subsequent work), two authors (Wheeler & Cooper) have set up a Community Interest Company (iCARP CIC) in order to provide more outdoor pursuit experiences for more veterans. They receive no income for this venture. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

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.)