This unit describes the skills required to conduct environmental tests in the explosive ordnance environment. Explosive ordnance environmental tests are conducted to ensure weapons systems or small arms ammunition in service meet the required standards. The environmental tests are a common component of explosive ordnance quality assurance. The environmental tests can be conducted as a component of the assessment of safety and suitability for service (S3 process) or as an in-service survey.This unit was developed for proof, trials and experimental testing specialists working within proof, trials and experimental organisations in Defence, but is applicable to any individual in this field of work.The skills and knowledge described in this unit must be applied within the legislative, regulatory and policy environment in which they are carried out. Organisational policies and procedures must be consulted and adhered to.Those undertaking this unit would work independently and as part of a team under direct and/or indirect supervision. They would use discretion and judgement, and take responsibility for the quality of their output. They would perform routine tasks in range of contexts.No licensing, legislative or certification requirements apply to unit at the time of publication.