Why is a "Cobra Ball" Aircraft Flying Over Des Moines and Omaha?

Why is a "Cobra Ball" Aircraft Flying Over Des Moines and Omaha?

As of 1:11 AM eastern US time on 14 January 2021, a COBRA BALL aircraft took off out of Des Moines, IA, circled the city numerous times, then headed out over Omaha, NE and is presently circling that city.