They all had to fly on their own, though the expenses were provided by Sanctum. Afterwards, they were met at a pickup point, where they were driven to the Sanctum HQ via a bus, this was a covert thing, making them look like internship students on tour of the base. Also, the rules for the students will be explained in RP, it will have some ties to military regulation, but at the end of the day most of them are still kids so it'll be a bit different.