Abstract: A system to simulate in-flight aircraft combat includes an energy sensitive switch intermediate a power source and signal generator. The switch has a first state which prevents the transmission of current from the power source to the signal generator and a second state which permits current to flow from the power source to the signal generator. The switch changes state when exposed to a given level of energy and permits current to flow to the signal generator which indicates a "hit". In a first embodiment, a sight is provided to align the attacking aircraft with the target. A trigger mechanism is mounted in the attacking aircraft which initiates the transmission of current from the power source to the signal generator. The optical switch changes state in response to exposure to energy emitted from an energy source mounted on the target. The pilot of the attacking aircraft trips the trigger when the target is aligned relative to the sight.