[quote][b]Posted by:[/b] otterboyz the cole protocol, as seen [url=http://www.bungie.net/projects/reach/article.aspx?ucc=intel&cid=27031]here[/url] only applies to space vessels and space facilities, so everything could have already of been purged on the 24th, the circumference could of easily had the date of the hack attempt by cortana moved back to an earlier date [/quote] Or it arrived at Reach late into the fighting at some point when it wouldn't have to purge its NAV Data just to jump into the system, and then it gets erased because of Cortana poking around. And then because it doesn't exist and because they're caught by surprise by the appearance of the [i]Fleet of Particular Justice[/i] and because the [i]Circumference[/i] "doesn't exist" it isn't discovered that it wasn't purge until almost too late.