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There are a number of criteria for classification of UAVs. It is convenient to have a generally agreed upon scheme for classifying UAVs rather like the classification of military aircraft in general into such classes as transport, observation, fighter, attack, cargo, and so on. Table 2.1 provides some criteria for classification of UAVs, and their related classes.

Parts 48 and 107 of FAR regulate the application of small UAVs. For instance, you may not operate an sUAS at night, which is defined in the US (except Alaska) as the time between the end of evening civil twilight and beginning of morning civil twilight. This is due to the fact that, at night, there is no sufficient visibility to the remote pilot. A small unmanned aircraft is defined as an unmanned aircraft weighing more than 0.55 lb and less than 55 pounds on takeoff, including everything that is on board or otherwise attached to the aircraft.

Table 2.1 Criteria for classification of UAVs

No.	Classification Criterion	Class
1	Manufacturing location	1. Home‐made (Model), 2. Industrial
2	User	1. Civil, 2. Military
3	Mission	1. Filming, 2. Package delivery, 3. Intelligence, Surveillance, and Reconnaissance (ISR), 4. Precision strike, 5. Combat (UCAV), 6. Teaming, 7. Meteorological measurements, 8. High‐altitude platform, 9. Search and observation
4	Size	1. Micro, 2. Mini, 3. Very small, 4. Small, 5. Medium, 6. Large
5	Wing configuration	1. Fixed‐wing, 2. Rotary‐wing (includes multi‐copter), 3. Hybrid
6	FAA [5]	Small UAVs (under FAR Parts 48 and 107)
7	Altitude/Range/Endurance	1. Very low‐cost close range, 2. Close range, 3. Short range, 4. Mid‐range, 5. Long range, 6. Medium‐altitude, long endurance (MALE), 7. High‐altitude, long endurance (HALE)
8	Number of uses	1. Reusable, 2. Expendable

In the following sections, three specific classifications based on: (1) range and endurance, (2) mission, and (3) tier (for US Air Force, Marine Corps, and Army) are presented.