oath of allegiance

[kingapolloxxxii]

I have been reading several articles on Saudi Arabia's new King Salaman; its interesting reading the oaths given to him by everyone from family, tribal leaders to common folks; i am curious about oaths given to the British monarch; i know they are made when one is elected or appointed to office, join the armed forces etc.
I hope she lives many more years but once The Queen dies will all the government officials, members of the armed forces, etc have to swear a new oath to Charles III?

[observer]

"...but once The Queen dies will all the government officials, members of the armed forces, etc have to swear a new oath to Charles III?"

Probably not - oaths of allegiance are to the sovereign, heirs, and successors, so there is no need to take the oath again.

Incidentally, there has been some suggestion that Charles favors George VII, after his grand-father, rather than Charles III as his regnal name.

I believe that George Washington swore oaths of allegiance to the King as a Vestryman, as a surveyor, and as a militia officer, before renouncing his allegiance.