Part of the problem is that the military awards contracts that are sometimes decades long. What was "good enough" security in 1990 is not looking so hot 20 years on. The US military machine may not perform as well as it has in the past in the new era of betas, hotfixes and patches. I will not be at all surprised when insurgent "rc-plane" drones start showing up with cell phones, arduinos, grenades and duct-tape.
It's dreadfully easy to shop build a rocket, especially in America where places like Radioshack exist.
Radioshacks only sell cellphones (mostly) now. :(