Ground Effect is the increase in the force acting on a lifting surface such as a wing when it gets very close to the ground. Ground Effect Vehicles (GEV) compress air between the vehicle’s wings and the ground (sea or Earth’s surface). GEV systems take advantage of the aerodynamic interaction between the sea or ground surface and the wing. GEV systems can be defined as a type of amphibious vehicle that flies close to the ground and increases its efficiency. The efficiency of GEV systems is 3–4 times higher than other aircraft. The term Ground Effect (GE) is defined as the increase in the lift-drag ratio (L/D) of the wing at a cruising altitude lower than the chord length of the wing (Chord Length), preferably at a value lower than 25% of the chord length. As the wing gets closer to the sea surface, it does not allow the free-flowing air under the wing to expand. This increases the static pressure and therefore the lift force. At the same time, the downflow velocity caused by the wing tip vortex decreases, which contributes to the increase in the L/D ratio. Studies on the use of GEV (Ground Effect Vehicle) systems for different purposes are ongoing. Defense is at the forefront of these areas of use. Especially considering the development of unmanned aerial vehicles, unmanned WIG vehicles (UWIG) are of greater importance. In this study, studies on unmanned ground effect vehicle systems are examined and examples of their use in the field of defense are given.