Once, their purpose was to add a layer of security when communicating over insecure technology. However, today they play a more ceremonial, logistical role.
A Secret Service spokesperson once told The Washington Post that the names shouldn't be scrutinised too closely as they are collated on "sheer whim" by the White House for a candidate to pick from.
Now, JD Vance has been given a secret codename of his own after he was announced as Trump's running mate for his 2024 presidential campaign on 15 July - just two days after the former president was almost assassinated.
According to the Daily Mail, the Ohio senator has been known to the agents protecting him as "Bobcat."
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Carse justifies England faith as the archetypal bold pick
If you won a boxing match after your opponent continually punched themselves in the face, how much credit can you take?
Tenacious Diallo the key to Amorim pressing machine
Old Trafford has not seen anything like this before.
Gold King Cole packs the Bridge with merry old souls
In the 83rd minute, the ball rolled to the feet of Cole Palmer in a bubble of space outside Aston Villa's box, and the crowd snapped to attention.
Vibrant Anfield marks the changing of the Guardiola
There was a lull in the noise, a break in the Anfield atmosphere, when a defiant chant emerged from a corner near Stefan Ortegaâs goal.
What is so daunting about Spain's new data checks?
Q You have written about the new âred tapeâ for visitors to Spain. So, as well as your usual passport details you will give a contact number, address and email. Not exactly the Spanish Inquisition, is it?
Sectarian clashes claim at least 130 lives in Pakistan
At least 130 people were killed in deadly sectarian clashes in Pakistan's northwestern Kurram district in spite of a tentative ceasefire, days after gunmen opened fire on a convoy of vehicles carrying Shia Muslims, local officials said.
Coalition government likely in Ireland as count proceeds
Fianna Fail say decisions on power-sharing for another dayâ
How Syria's forgotten war is back on the world's agenda
Many believed the country was lost in an unsolvable conflict, until everything changed in a matter of days, writes Bel Trew
Assad regime scrambles to halt Syrian rebelsâ advance
Civilians reportedly killed by Russian and Syrian airstrikes
Mother of poisoning victim says she knew she would die
Lawyer Simone White succumbed to the effects of methanol while backpacking in Laos with two of her childhood friends
