Abstract:Through the lens of the ecological systems theory, this quantitative dissertation study examines Veterans' perceptions of the risk variables of post-service suicidal ideation. In the framework of multiple ecological systems, it examines the effects of military service, mental disorders including PTSD, depression, and BPD; adverse childhood experiences (ACEs), military sexual trauma (MST), as well as shame and guilt. As part of the research design, Veterans who had post-service suicidal thoughts filled out a survey questionnaire. Veterans' perceptions of risk factors across multiple ecological systems, including the microsystem (individual factors), mesosystem (interpersonal relationships), exosystem (community and institutional factors), macrosystem (cultural and societal influences), and chronosystem (time-based factors), were assessed using validated scales and measures in the questionnaire. The study's findings assist in the understanding of how Veterans perceive the risk factors connected to post-service suicide ideation in ecological systems. The findings emphasize the complexity of risk variables and the significance of considering the numerous systems in which Veterans are entrenched. Comprehensive and integrated interventions focusing on individual, interpersonal, communal, and societal levels are necessary to successfully address these risk factors and support Veterans' mental health. The information gained from this study can be used to direct the creation of evidence-based practices, regulations, and assistance programs that completely fulfill the special requirements of Veterans who are experiencing post-service suicidal ideation.