What are some of the Secret Service code names given to US Presidents?

US Presidents and prominent individuals who are under the protection of the Secret Service receive code names, which are usually ceremonial. As per Britannica, US President Joe Biden's code name is 'Celtic', while Donald Trump's is 'Mogul' and Barack Obama's is 'Renegade'. Vice President Kamala Harris picked 'Pioneer' as her Secret Service code name, CNN had reported earlier.