Flak Trooper

"Flak troopers? Oh yes. Lisa must've built this to make American, South Korean, South Japanese and Taiwanese planes down so their countries' respective air forces could be terrified, even their allies' respective air forces as well."

--Su Ji-Hoon, The Coming Apocalypse

A flak trooper is an anti-air infantry unit used by the Russians during the Third World War.

In When the Cold Breeze Blows Away, they are trained by Astrid and Zooey. They will fight for Russia and the Coalition of the Red Star when Lisa created a flak gun.