An operational conversion unit (OCU) is a unit within an air force whose role is to support preparation for the operational missions of a specific aircraft type by providing trained personnel.
These units are responsible for converting aircrews to the Lockheed Martin F-35 Lightning II, F/A-18F Super Hornet and Boeing P-8 Poseidon aircraft, respectively.
It flies the RNZAF's 4 Beechcraft Super King Air B200 in a Twin Engine conversion role.
It flew the TA-4K Skyhawk in a Fighter Conversion Role but was mothballed along with the rest of the RNZAF's Air Combat Wing in 2001.
Royal Air Force OCUs have their origins in the post-war period.