The US military categorizes UAS (aka drones) into five different groups based on size and capabilities.
Category: Department of Defense
What Aircraft Does The US Coast Guard Operate?
The US Coast Guard operates a small air force of around 200 fixed-wing and rotary-wing aircraft.
US Secretary Of Defense Asks Lawmakers To Clear $61.2 Billion To Reinforce Air Dominance
Almost half the air power allocation will go towards combat aircraft.