Aerospace glossary
UAS groups 1–5
The US military's five size classes for uncrewed aircraft, set by weight, normal operating altitude and speed.
| Group | Max takeoff weight | Normal operating altitude | Speed |
|---|---|---|---|
| 1 | 0–20 lb | below 1,200 ft above ground | below 100 kt |
| 2 | 21–55 lb | below 3,500 ft above ground | below 250 kt |
| 3 | below 1,320 lb | below 18,000 ft above sea level | below 250 kt |
| 4 | above 1,320 lb | below 18,000 ft above sea level | any |
| 5 | above 1,320 lb | above 18,000 ft above sea level | any |
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