The aim of this thesis is to explore the transition experiences of veterans when they leave the Armed Forces. Paper one consists of a literature review: a systematic search of relevant databases identified eight studies that are described and critically appraised. Thematic analysis produced four themes: 1) Mental health; 2) Length of Adjustment; 3) Barriers to transition and 4) Social Support. This review recommended that further research should explore qualitative methods with male and female British veterans. Paper two is a qualitative study exploring the experiences of medical discharge and the process of transitioning to civilian life in a sample of British veterans with PTSD. Purposive sampling was used to interview seven males receiving treatment at Combat Stress. Transcripts were analysed using Interpretative Phenomenological Analysis (Smith, Flowers, & Larkin, 2009) and four super-ordinate themes were identified: identity; disconnection; the will to live; and reaching out for help. Key findings are explored in relation to coping styles, shame and stigma, and Social Identity Theory (Tajfel & Turner, 1979). Future research should consider how to support this subgroup of veterans, and more qualitative methodology is needed to explore the individual transitional experiences. Paper three provides a personal reflective commentary of completing the research; the process of selecting a research topic; feelings of surrendering control; working with veterans; therapist versus researcher conflicts; and the researchers own connections with the military.