Republicans, conservatives and others have mocked the Biden administration’s decision to use a $400,000 missile to shoot down what may turn out to be a $12 hobby balloon last weekend, with some calling it an expensive way to eliminate a “kids’ science project.” The Northern Illinois Bottlecap Balloon Brigade told Aviation Week that one of its tracked balloons vanished on Feb. 11 — around the same time President Biden gave orders to shoot down a mystery object over Canada’s Yukon Territory. While the White House hasn’t yet confirmed the Illinois enthusiast club’s fears that its balloon was destroyed, the revelation...