One of the sea defense strategies in the scope of deterrence is by presenting the Indonesian Navy force in the sea. This demands the readiness of the Indonesian Naval Vessel includes the platform material readiness and its personnel. The Indonesian Naval Vessel unit is generally different from the land unit makes it difficult the crew and need the health manipulation to avoid health problems or diseases that can interfere with their performance. Research errors regarding the implementation of the Indonesian Naval Vessel crew/soldier medical checks at the 1st Fleet Command Health office for readiness in order to support the defense task, the factors that influence and what is the effort supposed to do. The aim of the study was to analyze the implementation of the Indonesian Naval Vessel crew checks at the 1st Fleet Command Health Office what factors influenced and the best strategies implemented to obtain optimal results of the implementation of the Indonesian Naval Vessel crew soldier medical checks. This study uses a qualitative method. The analysis uses the theory of policy implementation from George Edward III. Data were obtained from informants related to the implementation of medical checks for Indonesian Naval Vessel crew in 1st Fleet Command which were then analyzed using qualitative. The results showed that the implementation of medical checks for Indonesian Naval Vessel crew was not optimal. Efforts are being made to coordinate at the planning stage, it is necessary to make a policy that requires Indonesian Naval Vessel crew to carry out medical checks without exception and provide Covid-19 vaccinations. So that soldiers can serve optimally.