The host nation always marches out last at the Olympics opening ceremony.
The Host Country.
The host country's team marches in last during the Opening Ceremony's Athletes' Parade.
The opening ceremony happens at the Olympic stadium of the country hosting the games
All teams go in the opening ceremony. Greece goes first, he host country goes last, and the rest is in alphebetical order by the host country's national language.
Greece is always the first country in the Olympic Opening Ceremony, because the Olympics originated from Greece.
To represent every single country
Whichever country is hosting the Olympic Games.