In 2001, the Department of Defense funded an ongoing study of current and former service members to evaluate the long-term health effects of military service, including deployments. Almost 150,000 participants have been recruited so far and have agreed to complete one questionnaire every three years. This is an example of

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This study is following a group of individuals (current and former service members) over time, which makes it a prospective study. It is also a cohort study because the participants are being classified based on their military service. The study is observational because the researchers are not intervening or manipulating any variables. Finally, the sample is not necessarily representative of the general population, so it is not a random sample, indicating that it is not a convenience sample.

In 2001, the Department of Defense Funded an Ongoing Study