Helicopters are taking on some counter-drone missions in Israel and Ukraine to augment their strained air defenses. Here, an Israeli Apache AH-64 attack helicopter flies over the Mediterranean.JACK GUEZ/AFP via Getty ImagesGiven the sheer volume of enemy drones, helicopters have joined the counter-drone fight. In Ukraine and Israel, helicopters of all kinds are hunting down drones.Helicopter cannons are much cheaper than jets armed with missiles, but they're no substitute.