IoT has the potential to become the most important concept that has led to a huge information and communication technology revolution in recent decades. In fact, the concept of the Internet of Things defines a global Internet-based network in which all objects can connect, exchange information and perform intelligent activities. This new concept has affected both civilian and military applications of its new definitions. With the advent of the Internet of Things, as well as the ability to connect various weapons systems to the network, the opportunity for commanders to facilitate weapons control and the speed of action in the reactions arises. In the meantime, and more than civilian applications, military IoT applications, known as the MIoT domain, are more important because they can have positive or destructive direct impacts on battlefields. Therefore, the security issues associated with different parts of the Militarily Internet of Things are critical. In this article, we will first discuss the concepts and architecture of the Military Internet of Things (MIoT) and review the mechanism of the Military Internet of Things with a focus on the United States MIoT. Then, we discuss security challenges and concerns, and finally, outline the Internet of Things security requirements for military things.