Just testing to see if they actually work?
No better way
Using three different guidance systems -- radar, heat seeker, and homing on laser light bounced off the target -- Stormbreaker is highly accurate and hard to jam. It can identify, track, and hit stationary or moving targets in any weather and at night. This includes moving land targets, like trucks or train cars carrying munitions or other Russian supplies as well as ships at sea.
That's mighty high for a plane to drop them!