Premise: No. 234 Squadron RAF had a long career within the RAF, being operational on flying boats in World War I and on fighter aircraft in World War II. After the war it remained a fighter unit till 1957. In its last incarnation the squadron was in turn Operational Training Unit (OTU), Tactical Weapon Unit (TWU) and part of No. 4 Flying Training School RAF until lastly disbanded in 1994.
Hypothesis: No. 234 Squadron RAF boasts the longest career in the RAF.