In modern societies, we are increasing our reliance on widespread technological advancements in computer and electronic systems. The diverse activities of our society such as communication (voice and data), emergency management, air-traffic safety and control, law-enforcement (police and fire), ambulance, hospitals and commerce (both internet and otherwise), have become increasingly dependent on these advancements in technology. Such sophistication comes with a price of vulnerability from a wide variety of threats. There is a diversity of threats, one of which is natural lightning, which happens to be the only threat made by nature. The remainder such as Nuclear Electromagnetic pulse (NEMP), High-Power Microwaves (HPM), and Short Pulse Technologies (also called Ultra-Wideband) are all made by mankind. HPM and Short Pulse technologies have beneficial applications as well. However, when such environments are created with a purpose of damaging electrical and electronic systems, it is classified as the Intentional Electromagnetic Environment or the IEMI. These threats can affect military assets, as well as civilian infrastructure. The effect or impact of an incident high-power electromagnetic environment on an electronic victim system may be natural, accidental, or intentional. In this presentation we will look at some examples of such incidents, including a commercial airline crash, as well as beneficial applications of electromagnetic energy.