The debate over whether epidemics are considered a security issue or not has been on the list again these days when the coronavirus (Covid-19) has taken thousands of lives worldwide. Such discussions, are such infectious diseases are a security thread, have recently been on the list since diseases such as the Ebola epidemic in West Africa (2014), the SARS (2003-Severe Acute Respiratory Syndrome) and the H1N1 flu pandemic (2009) outbroke. This report evaluates the effects of epidemic diseases on the armies and wars from past to present, the role of the armies in fighting these diseases and the evolution of this role over time, and finally the positive and negative consequences of the securitization of such health problems.