What is the mark designation of the Chinook helicopter?

The Chinook helicopter used by the RAF is designated as HC2. This designation indicates the helicopter's configuration and its primary role as a heavy-lift transport aircraft. The “HC” in the designation stands for "Helicopter Cargo," reflecting its capability to transport troops, equipment, and supplies. The number “2” indicates the specific model variant within the overall design lineage of the Chinook series.

The distinction in designations among the other options usually reflects differences in configuration or the specific roles different helicopters fill. The HT designation generally refers to training helicopters, which is not the primary purpose of the Chinook. Thus, HC2 is the correct designation for the operational and mission profile of the Chinook helicopter in the RAF fleet.