Using a short, unrelated word in all caps is the same system used for CIA cryptonyms.
CIA | Cia Berg | CIA cryptonym | Mary McCarthy (CIA) | CIA University | CIA Tibetan program | Astra-Unceta y Cia SA |
It loosely follows the history of the Berlin Tunnel (Operation Gold, covername: PBJOINTLY), which was built and run jointly by the CIA and the British SIS.