I don't use or scout military hardware but if I were planning to use fpv quadcopters for military use the first thing I'd do is get spread spectrum control hardware.

Most RC anymore used frequency hopping spread spectrum for control. Different brands use different amounts of frequencies they hop between. Though all still in the 2.4, 5.8, or different band. A very select few use two different wavelengths at once. (Dragonlink, crossfire)