Relativistic Heavy Ion Collider (at Brookhaven)

No "the" before RHIC

Acronym doesn't need spelling out for the CERN Courier

Regional Office for Science and Technology in Europe

Spell out in first use then use acronym for the CERN Courier

Radiation Safety Support Officer (HSE unit)

Rheinisch-Westfälische Technische Hochschule Aachen, a research university in Germany

Acronym doesn’t need spelling out for the CERN Courier