Military operations often require the support of field kitchens to meet troop consumption needs. In Indonesia the source of energy for cooking in the field kitchen usually comes from Liquefied Petroleum Gas (LPG). The use of LPG for cooking requires great effort in its transportation and takes up a lot of space. Anaerobic digestion has gained worldwide attention because it can convert organic waste into energy and offers significant environmental and economic benefits. An anaerobic digester or biodigester is a technology that utilizes a biological process in which organic matter is decomposed by anaerobic microorganisms in the absence of dissolved oxygen. This study aims to design and study the use of mobile biodigester as a sustainable energy source for heating and cooking in military operation compared to the usual operation. Kinematic modeling based on simple algebraic equations and few parameters used to estimate the size of the proposed mobile biodigester. The proposed mobile biodigester has 900 L volume capacity that can provide cooking energy for one company in military operation or equal to 90 people. Results showed that by utilizing minimal space in transportation, the mobile biodigester has the potential to be a sustainable and cost-effective solution for the energy needs of military units.