Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Call Sign that has a Tail Code of oy belong to Weapon Systems Officer Capt Charles B. Debellevue?

### Inputs:
table_name: table, columns: ['Date', 'Pilot', 'Weapon Systems Officer', 'Aircraft', 'Tail Code', 'Call Sign', 'Kill']

### Response:
SELECT Call Sign FROM table WHERE Tail Code = oy AND Weapon Systems Officer = capt charles b. debellevue