Air traffic controllers, firefighters, law enforcement officers, and nuclear materials couriers.
CFR · 2024-01-01 · US · Title 5
The annuity of an air traffic controller retiring under § 842.207 or a law enforcement officer, firefighter or nuclear materials courier retiring under § 842.208 is— (a) One and seven-tenths percent of average pay multiplied by 20 years; plus (b) One percent of average pay multiplied by the years of service exceeding 20 years.
official document · source cfr-2024 · id 5:§ 842.405